While he was investigating ways to improve the telescope, Newton made ______ discovery which completely changed ______ man’s understanding of colour.
A.a(chǎn); 不填B.a(chǎn); theC.不填; theD.the; a
A
根據(jù)語境得知牛頓的一次發(fā)現(xiàn)是泛指,應(yīng)用不定冠詞;man表示“人類”,其前不用冠詞。
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