题目内容

While I was walking alone down the street, three men came up to me and asked me for _____to the beach.

A
B
C
D

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Jack is among the brightest of his _____: He can speak several foreign languages and has won three national prizes.A. honorB. abilityC. generationD. edge

A
B
C
D

填写相应的介词或副词

尿酸是下列哪些化合物分解的终产物？

AMP
B. UMP
C. IMP
D. cAMP

限制性内切酶的催化活性比非限制性内切酶的催化活性低

A. 对
B. 错