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【多选题】
共部门供给公共产品效率较低的主要原因在于( )A.
、信息不充分
B.
、缺乏有效的约束与激励机制
C.
、偏好加总困难
D.
、政治家和消费者 “ 近视 ” 的弱点
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反馈参考答案：
举一反三
【简答题】半导体中有两种载流子即 和 。
【单选题】I thanked him for the offer but ___it___ .
A.
turned down
B.
turned out
C.
turned in
D.
turned over
【简答题】I thanked him for the offer but turned it ______.A. down
【简答题】I thanked him for the offer but turned it
______.
【简答题】I thanked him for the offer but____it_____..
【单选题】Though ______ he said was of little help to me, I thanked him all the same
A.
what
B.
which
C.
that
D.
who
【单选题】I thanked him for the offer but __________ it down.
A.
passed
B.
turned
C.
kept
D.
passed
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