单项选择题

It was reported that there was a traffic jam on the highway caused by heavy fog.

A．据报道，由于大雾高速公路上发生了塞车。
B．据报道，由于大雾高速公路上发生了交通事故。
C．据报道，大雾使交通在高速公路上受阻。
D．有记者说，由于大雾高速公路被封了。
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单项选择题
A survey was carried out on the death rate of new-born babies in that region, the results of which were surprising.
A．一项关于新生儿死亡率的调查在那个地区被展开，结果令人惊讶。
B．一项关于那个地区新生儿死亡率的调查被执行，结果令人惊讶。
C．那个地区的新生儿死亡率的调查表令人惊讶。
D．在那个地区进行了一次新生儿死亡率调查，结果令人惊讶。
单项选择题
The origin of language is ______.
A．clearly explained in this passage
B．a matter that can not be or has not been explained or understood
C．a question that was difficult to answer
D．a problem already solved
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