[单选题] 结合酶具有催化活性的条件是（）
选项（20分）：
二蛋爱偷懒 2dan.com.cn
二蛋说：在有限的条件下，二蛋将尽最大努力提供一个纯净无广告，无安装插件，无病毒，并且直观超级简洁的海量学习题目平台，感谢各位用户的支持！[单选题] 入侵检测系统在进行信号分析时，一般通过三种常用的技术手段，以下哪一种不属于通常的三种技术手段：（ ）A 模式匹配。 B 统计分析。 C 完整性分析。 D 密文分析。 |
[单选题] 以下不属于代理服务技术优点的是（ ）A 可以实现身份认证。 B 内部地址的屏蔽和转换功能。 C 可以实现访问控制。 D 可以防范数据驱动侵袭。 |
[单选题] 假设使用一种加密算法，它的加密方法很简单：将每一个字母加5，即a加密成f。这种算法的密钥就是5，那么它属于＿ ＿＿。A 对称加密技术。 B 分组密码技术。 C 公钥加密技术。 D 单向函数密码技术。 |
[单选题] A方有一对密钥（KA公开，KA秘密），B方有一对密钥（KB公开，KB秘密），A方向B方发送数字签名M，对信息M加密为：M’= KB公开（KA秘密（M））。B方收到密文的解密方案是＿＿＿。A KB公开（KA秘密（M’））。 B KA公开（KA公开（M’））。 C KA公开（KB秘密（M’））。 D KB秘密（KA秘密（M’）。 |
[单选题] 以下关于数字签名说法正确的是：（ ）A 数字签名是在所传输的数据后附加上一段和传输数据毫无关系的数字信息。 B 数字签名能够解决数据的加密传输，即安全传输问题。 C 数字签名一般采用对称加密机制。 D 数字签名能够解决篡改、伪造等安全性问题。 |
[单选题] 在以下古典密码体制中，属于置换密码的是（ ）。A 移位密码。 B 倒序密码。 C 仿射密码。 D PlayFair密码。 |
[单选题] 根据所依据的数学难题，除了（ ）以外，公钥密码体制可以分为以下几类。A 模幂运算问题。 B 大整数因子分解问题。 C 离散对数问题。 D 椭圆曲线离散对数问题。 |
[单选题] 在以下人为的恶意攻击行为中，属于主动攻击的是（ ）A 数据篡改及破坏。 B 数据窃听。 C 数据流分析。 D 非法访问。 |
[单选题] 以下关于计算机病毒的特征说法正确的是：（ ）A 计算机病毒只具有破坏性，没有其他特征。 B 计算机病毒具有破坏性，不具有传染性。 C 破坏性和传染性是计算机病毒的两大主要特征。 D 计算机病毒只具有传染性，不具有破坏性。 |
[单选题] 身份鉴别是安全服务中的重要一环，以下关于身份鉴别叙述不正确的是＿＿。A 身份鉴别是授权控制的基础。 B 身份鉴别一般不用提供双向的认证。 C 目前一般采用基于对称密钥加密或公开密钥加密的方法。 D 数字签名机制是实现身份鉴别的重要机制。 |
[单选题] – I am worried about my son’s eyesight so much. –A He always takes books so close to his eyes.。 B You think too much.。 C There’s nothing special.。 D Maybe you can take him to have a check.。 |
[单选题] –What do you think I should do? – _________________A I don’t know.。 B That’s not my business.。 C You must talk with him.。 D You’d better talk with him.。 |
[单选题] Police attempted to ____________ protesters marching towards the governor’s office building.A turn off。 B turn on。 C turn up。 D turn back。 |
[单选题] __________ Japan and __________ United States are separated by __________ Pacific Ocean.A the, the, the。 B /, /, the。 C /, the, /。 D /, the, the。 |
[单选题] Mr. White ____________ at 8:30 for the meeting, but he didn’t turn up.A should have arrived。 B should arrive。 C should have had arrived。 D should be arriving。 |
[单选题] Most wage claims are settled by ____________.A compromise。 B comparable。 C comfortable。 D concentrated。 |
[单选题] __________ violin is one of __________ hardest musical instruments to playA The, the。 B A, the。 C /, the。 D /, /。 |
[单选题] The number of deaths from heart disease will be reduced greatly if people ____________ to eat more fruit and vegetables.A persuade。 B will persuade。 C be persuaded。 D are persuaded。 |
[单选题] They said that food supplies were almost ____________.A existed。 B entered。 C exhausted。 D enquired。 |
[单选题] Mike is ____________ Johnson.A as successful a manager as。 B as a successful manager。 C as a manager successful as。 D as successful manager as。 |
[单选题] These local snacks taste ____________.A good。 B well。 C to be good。 D to be well。 |
[单选题] --What do you think of the new magazine? -- Oh, excellent. It’s worth ____________.A to read。 B to be read。 C reading。 D being read。 |
[单选题] There was no obvious reason why this could not be ____________ a film as the original.A possible。 B likely。 C easy。 D as good。 |
[单选题] – He must be a top student in his school. –A I have doubt.。 B There is no doubt about it.。 C Yes. No doubt.。 D It is not doubtful.。 |
[单选题] Sarah looked slender-waisted, ____________ and very beautiful.A fragility。 B to be fragile。 C fragile。 D weakly。 |
[单选题] It’s __________ windy day. Let’s stay indoors.A a such。 B such a。 C a so。 D so a。 |
[单选题] The school will give ____________ to science, math and modern languages.A balance。 B surroundings。 C hobby。 D priority。 |
[单选题] __________ Shangrila Hotel is just __________ fifteen-minute walk from __________ university campus.A The, a, a。 B /, a, /。 C /, a, the。 D The, a, the。 |
[单选题] Without __________ music, life would be __________ mistake.A the, the。 B a, the。 C /, a。 D the, a。 |
[单选题] Be careful when you cross this very busy street. If not, you may ____________ run over by a car.A have。 B get。 C become。 D turn。 |
[单选题] Some first-generation college students carry __________ hopes and dreams of __________ parents for a better life than they have had.A /, their。 B their, the。 C the, their。 D the, /。 |
[单选题] I had some trouble __________ the letter. His handwriting is very bad.A on reading。 B reading。 C to read。 D read。 |
[单选题] – Let’s go fishing. –A How could you do that?。 B I have no interest.。 C No, are you crazy?。 D I’d like that. But I can’t afford time.。 |
[单选题] I want to learn____________ about the industry so that I'm better prepared.A possible of。 B as much as possible。 C as possible much。 D as possible as much。 |
[单选题] –I don’t know which major I should choose to study. – _________________A I have no idea.。 B Have you ever thought of computer science?。 C You ask a wrong person.。 D You don’t know at this moment。 |
[单选题] – Will they go for a picnic today? – _________________A Yes, perfectly.。 B Yes, it is.。 C Well, it depends.。 D Not at all.。 |
[单选题] – Will you be able to finish the job this month? – _________________A I can't say so.。 B I'm not sure so.。 C I don't know so.。 D I don't expect so.。 |
[单选题] Jane kept weighing herself to see how much ____________ she was getting?A heavier。 B heavy。 C the heavier。 D the heaviest。 |
[单选题] He seems so honest and genuine and my every ____________ says he's not.A instinctive。 B instinctively。 C instant。 D instinct。 |
[单选题] I turned back after a while, but he ____________ walking.A kept on。 B kept from。 C 经kept with。 D kept to。 |
[单选题] – Would you like a cup of coffee? –A I dislike coffee.。 B It tastes terrible.。 C No, thanks. I’ve had at home.。 D Why not?。 |
[单选题] – How about going to see a film tonight? –A Oh, it couldn’t be better.。 B Yes, I will go.。 C Of course.。 D Yes, I think so.。 |
[单选题] Many foreign tourists prefer to cut a check to ____________ travel expenses.A give。 B cover。 C take。 D clean。 |
[单选题] The willow is __________ tree that blooms once __________ year in spring.A the, the。 B the, a。 C a, the。 D a, a。 |
[单选题] –What about going shopping together? – _________________A It sounds good.。 B I prefer go alone.。 C I am occupied.。 D I have no time.。 |
[单选题] Children should be taught not to __________ handicapped people.A glare at。 B stare at。 C glance at。 D peep at。 |
[单选题] – I believe they have finished their tasks. – _________________A No, I’d rather not.。 B No, it can’t be true.。 C No, I don’t think so.。 D No, it isn’t the same.。 |
[单选题] I will never again ____________ the noble potato, golden fruit of the earth, to which we owe so much.A take off。 B take back。 C take sth. for granted。 D take down。 |
[单选题] – Should I book a table in advance? –A That’s a good idea.。 B You are so cautious。 C Why do you always want to do such thing?。 D Oh, forget it.。 |
[单选题] The discovery of new evidence led to ____________.A the thief having caught。 B catch the thief。 C the thief being caught。 D the thief to be caught。 |
[单选题] I was one of those people who went to __________ college knowing exactly what I wanted to do with __________ life.A /, my。 B a, the。 C /, the。 D my, my。 |
[单选题] – How do you think about the result? – _________________A It’s hard to say, actually.。 B No, I don’t know。 C of course not.。 D I never think of it.。 |
[单选题] __________ banker is __________ man who lends you __________ umbrella when the weather is fair, and takes it away from you when it rains.A The, the, the。 B A, a, an。 C A, the, an。 D The, a, an。 |
[单选题] We are puzzled __________ how it happened.A as usual。 B as yet。 C as well。 D as to。 |
[单选题] The international table tennis game will come to us ____________ from Germany.A lively。 B alive。 C live。 D living。 |
[单选题] ____________ the way we had come, we could see the whole valley spread out behind us.A Looking back。 B Having looked back。 C To look back。 D Being looked back。 |
[单选题] The director spent as much time staying in office as he ____________ walking around the plant.A does。 B had。 C was。 D did。 |
[单选题] –I can’t sleep well recently. – _________________A Me, too.。 B You work too hard.。 C Why don’t you talk to your doctor?。 D Why bother?。 |
[单选题] According to the art dealer, the painting ____________ to go for at least twenty thousand pounds.A is expected。 B expects。 C expected。 D is expecting。 |
[单选题] We are masters of our own ____________.A destiny。 B destined。 C destination。 D determination。 |
[单选题] Workers in big firms receive a ____________ part of their pay in the form of bonuses and overtime.A enough。 B substantial。 C lot。 D amount。 |
[单选题] You’re ____________ your time trying to persuade him, he will never join us.A spending。 B losing。 C wasting。 D missing。 |
[单选题] Jim couldn’t remember when he first met Professor Wang, but he was sure it was __________ Sunday because everybody was at __________ church.A /, the。 B the, /。 C a, /。 D /, /。 |
[单选题] George is studying __________ Chinese geography and his sister Ann is studying __________ history of China.A the, the。 B the, /。 C /, the。 D /, /。 |
[单选题] We always ______ all sorts of warning signals about our health, leaving regrets in the end.A overlooked。 B overtook。 C overacted。 D overemphasized。 |
[单选题] –If you were in my position, what would you do? – _________________A Hi! It’s you problem.。 B I weren’t you.。 C If I were you, I would give up.。 D I don’t know.。 |
[单选题] — ____________________________ — It has been a pleasure. Goodbye! — Goodbye!A It was nice of you to come to see me.。 B See you later.。 C Stay in touch.。 D Hope to see you soon.。 |
[单选题] — ____________________________ — Won't you have another coffee?A Thank you very much for a wonderful party。 B I’m glad to have met you.。 C Thanks for all your hospitality.。 D Sorry, it's time I left now.。 |
[单选题] Children are encouraged to put ______ some of their pocket money to buy Christmas presents for the poorer ones.A in。 B off。 C away。 D aside。 |
[单选题] Schumacher ____________ effortlessly to his new surroundings.A adopted。 B adapted。 C accepted。 D obtained。 |
[单选题] As days went by, a deep friendship began to ______ between them.A become。 B develop。 C come。 D stand。 |
[单选题] The scenic spot is crowded with tourists ______ all through the year.A at a time。 B at other times。 C at all times。 D at one time。 |
[单选题] The hooligan is __________ at a passing pretty girl．A glancing。 B leering。 C glare。 D look。 |
[单选题] In the area, AIDS is __________ disease that the very mention of it strikes terror into the population.A a so dreadful。 B so dreadful a。 C such dreadful。 D a such dreadful。 |
[单选题] ______ yourself in other’s shoes, then you will never do the wrong thing.A Set。 B Make。 C Take。 D Put。 |
[单选题] Mary insisted ______ being present at all the interviews with the foreign company.A with。 B on。 C in。 D at。 |
[单选题] A man I easily ______ as Bob’s father sat there with a newspaper in hands.A knew。 B understood。 C had。 D recognized。 |
[单选题] She was 17 at that time and the experience molded (造就) her ______.A person。 B personnel。 C personality。 D personal。 |
[单选题] He took a taxi to the airport in a hurry ______ find that he forgot the ticket at home.A to。 B in order to。 C only to。 D as to。 |
[单选题] He has very __________ eyes; he catches sight of things quickly.A shortsighted。 B farsighted。 C sharp。 D big。 |
[单选题] I couldn’t __________ who he was.A find out。 B set out。 C fill out。 D figure out。 |
[单选题] It is a(an) ______ of setting your goals and following them.A thing。 B event。 C matter。 D affair。 |
[单选题] Lots of children have ______ friends.A image。 B imagination。 C imaginary。 D imaginative。 |
[单选题] He is __________.A aggressive。 B progression。 C congress。 D digress。 |
[单选题] Human beings are social animals; therefore, we need friends and I’m __________ exception.A above。 B beyond。 C without。 D no。 |
[单选题] The police insist that Michael did not follow the correct ______ in applying for a visa.A process。 B progress。 C program。 D procedure。 |
[单选题] Make sure that you drink plenty of ______ before you have a shower.A solid。 B gas。 C fluid。 D thing。 |
[单选题] She is a creature of emotions, ______ reason.A than。 B but than。 C rather than。 D other than。 |
[单选题] She is ______ to accept change, though she has been living in the small village for 60 years.A like。 B likely。 C unlikely。 D alike。 |
[单选题] ______ are journalists admitted to this region.A Ever。 B Rarely。 C Always。 D Not。 |
[单选题] He looked me right __________ the eyes and lied.A at。 B in。 C for。 D on。 |
[单选题] —I’m glad to have you here. Do drop by if you have time. — ____________________________A Thanks, I will.。 B See you tomorrow.。 C Well, take care of yourself.。 D Hope to see you soon.。 |
[单选题] Don’t use __________ plate as __________ ashtray.A the, the。 B the, an。 C /, an。 D /, /。 |
[单选题] __________ division between English-speaking Canadians and French-speaking Canadians is __________ important issue Canada is faced with.A An, the。 B An, an。 C The, the。 D The, an。 |
[单选题] —Thank you for everything. — Well, have a nice trip and best wishes to your wife. — Thanks. ____________________________A Just stay here。 B I know.。 C I hope we meet again soon。 D I’m on my way.。 |
[单选题] Though quick-tempered, he is a good man, ______.A in no way。 B in the way。 C in this way。 D in some way。 |
[单选题] It took hours of study before the solution finally __________ him.A dawned on。 B relied on。 C taken on。 D impressed on。 |
[单选题] In fact, the panic is __________. As the map shows, the drought has been confined to the south and east of Britain.A overheard。 B overcharged。 C overdone。 D overtime。 |
[单选题] In the dictionary a workaholic is ____________ as a person obsessively addicted to work.A regarded。 B defined。 C taken。 D labeled。 |
[单选题] – So what should we do next？ –A Let’s have a cup of tea, and then discuss the plan.。 B I am not clear.。 C No hurry.。 D I’m too busy to do anything.。 |