At the top of the high mountains, there is very _____ oxygen in the air.
A．a(chǎn) littleB．littleC．a(chǎn) few D．few
B

試題分析：句意：在高山頂上，空氣中有少量的氧。few, a few是可數(shù)的, little, a little是不可數(shù)的。
few 和little表示很少，否定的意思。a few 和a little表示一些，肯定的意思。因?yàn)檠鯕馐遣豢蓴?shù)名詞，排除C、D；根據(jù)句意故選擇B。
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