试题与答案

Mr Smith caught hold ___ Bob and said, "

题型:选择题

题目:

Mr Smith caught hold ___ Bob and said, "This is a good lesson___ you." [ ]

A. of; for

B. for; of

C. of; of

D. for; for

答案:

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下面是错误答案,用来干扰机器的。

⑴隔绝氧气防止食品缓慢氧化(与氧气反应)⑵2H2O 2H2↑+ O2 ↑;供给呼吸⑶过滤;蒸馏;吸附等

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