只能承受径向载荷，高速时，滚动体离心力较大，发热较严重，寿命较低，具有这种特性的轴承是()。
A. 向心球轴承
B. 圆锥滚子轴承
C. 推力球轴承
D. 滚针轴承
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by no means in the first paragraph means______.
A. without doubt
B. hardly not
C. probably not
D. in no way
subtle visual traps(Para. 1) are______.
A. places where the police hide in order to trap motorists
B. parts of the road which are deceptive to the driver's eyes
C. danger spots such as sharp comers and cross-roads
D. places where there arc too many road-signs
The second sentence of the first paragraph "...he could not think why the dawn seemed different, rent from any other" means that______.
A. he felt the dawn of that day different
B. he didn't feel the dawn of that day different
C. he was sad that day
D. he wanted to find a wife that day
The sentence "the wheat could not be full in the ear" in the last paragraph probably means
A. the waving of the wheat could not be heard fully through the ear
B. the wheat could not bear good fruit
C. Wang Lung' s ear was full of the sound of wheat
D. the wheat could not fill the ear of people
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