单项选择题

（）是人们思想交流的渠道，它在人际交往中占据着无比重要的地位。

A.动作
B.语言
C.手势
D.表情

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IT professionals can develop applications that run on the Hadoop framework only in English.

答案：错误

单项选择题

The police throughout the district were ___________ as it was known that the prisoner had escaped.
A、 conscious
B、 delicate
C、 sensible
D、alerted