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
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