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【单选题】

The place __ the bridge is supposed to be built should be ____the cross-river traffic is the heaviest .

A.
which; where
B.
at which ;which
C.
at which ;where
D.
which ;in which
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A.
植物→鹿→羚羊→山鹰
B.
植物→鼠→蛇→山鹰
C.
阳光→草→兔→狐
D.
田鼠→蛇→山鹰
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A.
左下方
B.
右上方
C.
上方
D.
正下方
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A.
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B.
had they heard the news than
C.
did they hear the news when
D.
had they heard the news when
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【单选题】下面关于食物链中各种生物之间的关系，叙述正确的是（　　）
A.
相互竞争，相互排斥
B.
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C.
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D.
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