皮皮学，免费搜题
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【单选题】
当今世界，发展经济和科学技术成为世界各国普遍关心的问题，各国之间的竞争也越来越多地转向经济和科技领域，之所以会出现这种情况是因为（）A.
只要经济和科技实力提高了，综合国力就一定会提高
B.
国际竞争就是经济和科技实力的竞争
C.
提高经济和科技实力是解决国际争端的关键
D.
国际竞争的实质是经济和科技实力为基础的综合国力的竞争
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】While browsing, the mind is ________________; while searching, it is __________________.
A.
exploratory and focused; curious and purposeful
B.
exploratory and curious; focused and purposeful
C.
curious and focused; exploratory and purposeful
D.
curious and purposeful; exploratory and focused
【单选题】While browsing, the mind is _________ and _________; while searching, it is ________ and _______.
A.
exploratory and focused; curious and purposeful
B.
exploratory and curious; focused and purposeful
C.
curious and focused; exploratory and purposeful
D.
curious and purposeful; exploratory and focused
【简答题】While browsing, the mind is _____ and _____ ; while searching, it is _______ and ________ .
【简答题】Until yesterday, his family (not hear) from him for three years.A. hadn’t heard
【单选题】Until yesterday, his homework had not________finished.
A.
being
B.
be
C.
been
D.
to be
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