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【判断题】
质量的分越高越好,排名相同的位置,得分高,花费高( )A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】课堂讨论: 2. How can we more effectively enlarge our vocabulary?
【单选题】When scientists first warned in the 1970s that CFCs could attack ozone, the U.S. responded by banning their use in spray cans. But the rest of the world continued to use CFC - based aerosol cans, and ...
A.
Because the CFCs directly damage the people’s health.
B.
Because the CFCs are poisonous chemicals.
C.
Because the production of the CFCs costs a lot.
D.
Because the CFCs can attack ozone by liberating atoms of chlorine.
【单选题】Scientists first______the idea of the atomic bomb in the 1930s.
A.
competed
B.
conceived
C.
consumed
D.
concealed
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