Please remember to keep the medicine in a sealed container.
A. safe
B. tight-closed
C. qualified
D. mysterious
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The plant provides forty percent of the country's electricity.
A. factory
B. farm
C. station
D. dam
He insisted that she put forward the proposal at a proper time.
A. adequate
B. suitable
C. considerable
D. exact
Nevertheless, many people lack enviromental awareness.
A. Therefore
But
C. Instead
D. However
以下哪项是属于自然语言处理的领域( )。
A. 人脸识别
B. 指纹识别
C. 问答系统
D. 无人机