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问题 单项选择题 A1/A2型题

对Korsakoff综合症有明显疗效的是（）

A.维生素A

B.维生素B1

C.维生素B2

D.维生素B12

E.维生素C

答案

参考答案：B

解答题

已知集合A={x|（x+8）（x-5）≤0}，B={x|t+1≤x≤2t-1}．若A∩B=∅，求实数t的取值范围．
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选择题
一 I'm sure Andrew will win the first prize in the final.
一 I think so. He _____ for it for months.

A. is preparing
B. was preparing
C. has been preparing
D. had been preparing
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