问题
选择题
Polar bears live mostly on _____ sea ice, which they use as ___ platform for hunting seals.
A．a; a
B．a; the
C．不填；a
D．the; 不填
答案
答案：C
sea ice 海冰, 是固定结构，不用冠词；platform平台，是可数名词。
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Polar bears live mostly on _____ sea ice, which they use as ___ platform for hunting seals.
A．a; a
B．a; the
C．不填；a
D．the; 不填
答案：C
sea ice 海冰, 是固定结构，不用冠词；platform平台，是可数名词。