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【单选题】
某泵在运行时发现有汽蚀现象应（ ）。A.
停泵，向泵内灌液
B.
降低泵的安装高度
C.
检查进口管路是否堵塞
D.
检查出口管阻力是否过大
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反馈参考答案：
举一反三
【简答题】Compared ______ English, Chinese is generally believed to be more difficult to learn. A: with B; from C; against
【单选题】Ilike Beijing Opera, and we can ______ Chinese history. [ ]
A.
learn from
B.
learn about
C.
learn to
【简答题】It is difficult for a (foreign) ______ to learn Chinese.
【单选题】---Can you tell me how to learn Chinese well? ---Sure. The best way _____ Chinese is often using it more.
A.
in learn
B.
learning
C.
to learn
D.
of learn
【简答题】For those foreign students who are interested in (learn) ______ Chinese, the university offers a Chinese program every summer.
【简答题】几乎所有的动物和一半以上的高等植物都是二倍体。
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