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