As the sea ice melts sooner each swimmer,polar bears are for
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As the sea ice melts sooner each swimmer,polar bears are forced to come ashore earlier and face food shortages _____ they have stored enough fat to last them through the season. |
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A.before B.unless C.since D.until |
A
As the sea ice melts sooner each swimmer,polar bears are for
( )Polar bears live mostly on _____ sea ice.A.a B.an C./ D.t
How big are polar bears
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There are no polar bears in the south pole同义句 There are----
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The polar ice cap ______ at the rate of 9% per decade as a r
用所给词的适当形式填空. 1. The polar bears are kind of &nbs
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The bears are _____.