题目内容

“CTAB法”和“SDS法”是提取DNA的常用方法. ( )

A. 对
B. 错

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DNA的提取过程中,必须剧烈震动混匀,这样才能使反应试剂充分接触,反应充分进行。( )

A. 对
B. 错

A. Complete each sentence with the given verb in its indefinite tense.1. Tom ____ (play) football with his friends after school.2. The classroom (have) eight big windows.3. _you _ (visit) your relatives last Spring Festival?4. — he (fly) a kite on Sunday?— Yes, he .5. I ________(give) it to you as soon as he comes back.

Where do your grandparents live?

A. No, they live in the country.
B. They lived in the city.
C. They live in the country.
D. They used to live in the country.

Does Peter go to school by subway?

A. No, he does.
B. No, he doesn't.
C. Yes, on foot.
D. Yes, he is.