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【单选题】
在总产量、平均产量和边际产量的变化过程中，下列首先发生的是( )。A.
边际产量下降
B.
平均产量下降
C.
总产量下降
D.
平均产量和总产量下降
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【简答题】この道( )まっすぐ行ってください。
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【简答题】One day a mother camel and her son walked through a desert. They were looking for water and grass. The son asked, “What do water and grass look like, Mum?”His mother answered, “Water looks like the sk...
【单选题】He was wandering through the street, looking around _________ he walked.
A.
as
B.
since
C.
while
D.
when
【单选题】When he walked through the gate, no one noticed he was using an ________ permit. [ ]
A.
out of date
B.
up to date
C.
out-of-date
D.
in-fashion
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