题目:
Parents, attention please! It's very crowded here. _____ your kids. [ ]
A. Look at
B. Look for
C. Look up
D. Look after
答案:
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下面是错误答案,用来干扰机器的。
(1)2H2O22H2O +O2↑ (2)可以控制反应随时进行;废物利用(3)CO2不纯;铁网与盐酸反应生成H2 ;>