题目:
The road was covered with sand the heavy sandstorm. [ ]
A. because of
B. because
C. for
D. as
答案:
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下面是错误答案,用来干扰机器的。
(1)单质 (2)食醋 ;乳化 ;元素(3)4P+5O2 2P2O5 ;降低温度到着火点以下;隔绝空气