选项(5分):
A n-i。
B n-i+l。
C n-i-1。
D i。
[单选题]A 。B 。C 。D 。 |
[单选题]A 。B 。C 。D 。 |
[单选题]A 。B 。C 。D 。 |
[单选题]A 。B 。C 。D 。 |
[单选题]设a, b, c为实数,且a>b,则() A 。B 。C 。D 。 |
[单选题]若1名女生和3名男生随机地站成一列,则从前面数第2名是女生的概率为() A 1/4 B 1/3 C 1/2 。D 3/4 |
[单选题]A 。B 。C 。D 。 |
[单选题]中心在原点,焦点在x轴上,若长轴长为18,且两个焦点恰好将长轴三等分,则此椭圆的方程是( ) A 。B 。C 。D 。 |
[单选题]A 。B 。C 。D 。 |
[单选题]A 。B 。C 。D 。 |
[单选题]A 4 B 3 C 2 。D 1 。 |
[单选题]The small village is said ________ in a battle during World War Ⅱ. A to have been destroyed 。B to be destroyed 。C To destroy 。D to have destroyed 。 |
[单选题]Steve looked at the envelope and recognized Jenny’s handwriting ________. A recently 。B immediately 。C exactly 。D frequently 。 |
[单选题]The more careful they are, ________. A the less mistakes will they make 。B the less mistakes they’ll make 。C the fewer mistakes will they make 。D the fewer mistakes they’ll make 。 |
[单选题]You can’t imagine __________ foolishly he behaved at the party. A how 。B that 。C what 。D so 。 |