In the next decade, Robots will become practical because of all but one exception that ______.
A. they may cook hamburgers in the restaurants
B. they can perform wonderous skill as shown in science fiction film
C. they may deliver meal trays in hospitals
D. they may do some moppings in the shopping center
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The best way to save ozone is ______.
A. that CFC manufacture is completely forbidden
B. that the production of CFC is reduced
C. to find substitutes for CFCs
D. to reduce the danger of CFCs
The multi-tube boiler system made the Rocket, Robert's locomotive,______.
A. powerful
B. achieve a speed of 30 miles an hour
C. acquire 25 little tubes
D. good for hauling trains
我国社会主义改造完成以后，毛泽东以中国的实践经验为基础，运用马克思主义基本原理，全面阐述了社会主义社会的矛盾问题，并形成了比较系统的理论。他指出，推动社会主义社会不断前进的根本动力是 ( )
A. 非对抗性的人民内部矛盾
B. 对抗性的敌我矛盾
C. 社会主义社会的基本矛盾
D. 资产阶级和无产阶级的矛盾
According to the passage, what do student researchers often learn when they discuss their work in class
A. Other students rarely have objective comments about it.
B. Other students do not believe the researchers did the work themselves.
C. Some students feel that the conclusions are too obvious.
D. Some students do not understand the meaning of the researchers’ questions.
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