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19．The falling of apple from a tree helped Newton to discover law of gravity．（　�。�

A．

an； the

B．

an； a

C．

the； the

D．

the； a

分析一個蘋果從樹上掉下來幫助牛頓發現了萬有引力定律．

解答答案：A
題干中apple表示泛指一個蘋果，要與不定冠詞連用；the law of gravity萬有引力定律，名詞短語．故選A．

點評冠詞是一種虛詞，本身不能獨立使用，只能放在名詞前幫助說明名詞所指的人或事物，它是英語詞性中最小的一類，只有三個，一種是不定冠詞a，an；一種是定冠詞the．此外也有些特定場合不用冠詞，即通常所稱的零冠詞．不定冠詞表示泛指，定冠詞表示特指．

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