题目内容

本实验观察到的四种响应是严格意义上的四种响应

A. 对
B. 错

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本实验中所研究的系统是位于实验箱上的一个现成系统

A. 对
B. 错

these pictures, I couldn’t help thinking of those days when I was in Beijing and from the top of a thirty-stored building, Beijing looks more beautiful.

A. Seeing; seen
B. Seen; seeing
C. Seeing; seeing
D. Seen; seen

The missing boys were last seen ______ near the river.

A. playing
B. play
C. to play
D. to playing

______ is believing.

A. Seeing
B. To see
C. See
D. Seen