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【简答题】
需求缺乏弹性是指需求量变动的比率______价格变动的比率，需求富有弹性则是指需求量变动的比率______价格变动的比率。
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举一反三
【简答题】________ the earth to be flat, many feared that Columbus would fall off the edge of the earth. A) Having believed B) Believing C) Believed D) Being believed
【单选题】What causes the Earth to be warmer according to the video clip ?
A.
The atmosphere .
B.
The greenhouse gases .
C.
The sunbeams.
D.
The radiation from the outer space.
【单选题】_____ the earth to be flat, many feared that Columbus would fall off the edge of the earth. [ ]
A.
Having believed
B.
Believing
C.
Believed
D.
Being believed
【单选题】______ the earth to be flat, people feared that Columbus would fall off the edge of the earth.
A.
Having believed
B.
To believe
C.
Believing
D.
Believed
【单选题】_________ the earth to be flat, many feared that Columbus would fall off the edge of the earth.
A.
Having believed
B.
Believed
C.
Believing
D.
Being believed
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