Polar bears live mostly on _____ sea ice, which they use as ___ platform for hunting seals.
A．a(chǎn); aB．a(chǎn); theC．不填；aD．the; 不填
C
sea ice 海冰, 是固定結(jié)構(gòu)，不用冠詞；platform平臺(tái)，是可數(shù)名詞。
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