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【多选题】
移动商务发展进程中错误观点是A.
移动商务就是移动技术加商务
B.
移动技术的特征就是移动商务的特征
C.
移动商务的特征与电子商务特征相同
D.
移动商务具有很多电子商务不具备的特征
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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