单项选择题

A) cried C) said
B) asked D) shouted

A．cried
B．asked
C．said
D．shouted
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单项选择题
In the second paragraph the author uses an analogy (类比) that assumes that general principles are similar to______.
A．the wood
B．technical details
C．the trees
D．fixed laws
单项选择题
The last sentence of the first paragraph can best be understood as______.
A．most scientists are obliged to teach
B．a scientist may cultivate wide interests if he teaches as well
C．in order to keep up with developments in a wider field, teaching and research are both important
D．if a scientist does not teach, he is less likely to absorb diverse knowledge
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