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【单选题】
函数 是减函数的区间为 ( )A.
B.
C.
D.
(0,2)
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【简答题】幼儿教育心理学的研究对象是研究幼儿教育系统中幼儿( )的规律以及如何应用这些规律促进幼儿身心健康发展。
【单选题】A series of robberies ________ recently.
A.
has been reported
B.
has reported
C.
have been reported
D.
have reported
【单选题】Recently in China, the brain drain has been ______. That is to say, t here has been a _______ of the process across China. [ ]
A.
refuse. refusal
B.
change; change
C.
arrive; arrival
D.
reversed; reversal