2. 专升本
  3. Without our ______ means of air transportation—the aeroplane, we would have to slow our lives and commerce.

Without our ______ means of air transportation—the aeroplane, we would have to slow our lives and commerce.

admin2007-12-30  79
问题 Without our ______ means of air transportation—the aeroplane, we would have to slow our lives and commerce.
选项 A、principal
B、central
C、principle
D、protective
答案A
解析
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