皮皮学，免费搜题
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【单选题】
下列实例中,为了减小摩擦的是 ( )A.
要把拧得很紧的瓶盖扭开，在手和瓶盖间垫一块毛巾。
B.
手表上用于调节指针的旋钮刻有凹凸不平的条纹。
C.
为把玻璃窗擦的更干净些，要用更大一点的力压抹布。
D.
移动较重的货箱时，在货箱下面垫上几根圆木。
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皮皮学刷刷变学霸
举一反三
【单选题】Our teacher told us _______ in class .
A.
listened carefully
B.
to listen carefully
C.
listened careful
D.
to listen careful
【简答题】n. 运动;战役 vi. 作战;参加运动
【单选题】My mother was cooking while I____the radio.
A.
listened to
B.
have listened to
C.
was listening to
【单选题】They _____ the music. They say it is very wonderful. [ ]
A.
listened to
B.
have listened to
C.
are listening to
D.
listen to
【单选题】The boy _____ he took notes.
A.
listened with attention
B.
listening attentively while
C.
listened attentively before
D.
listening with attention
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