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问题
选择题
在-1,-2,-3,4这四个数中,任意两个数相乘,所得的积最大的是( )
A.4
B.6
C.-12
D.8
答案
答案:
B
选择题
下列现象与原子核外电子跃迁无关的是( )
A.激光
B.焰火
C.核辐射
D.霓虹灯光
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选择题
Computers and mobile phones, though they are indeed making our life _____ and more _____, have reduced the need for face-to-face communications.
A. easily; efficient
B. easier; efficient
C. easy; efficiently
D. easily; efficiently
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