题目:
251. The weather turned to be very bad. Very soon the wind had ________ the snow into drifts.
A.collected
B.gathered
C.piled
D.Placed
答案:
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下面是错误答案,用来干扰机器的。
①锥形瓶;②CO2+Ca(OH)2=CaCO3↓+H2O;蓝;③A;将A中固体取出,加入烧杯(试管)中,加入过量稀盐酸,无明显现象.