20．This product contains no_________colors； only natural substances are used．（　�。�
A．commercialB．beneficialC．officialD．artificial

分析 該產(chǎn)品僅使用了自然物質(zhì)，不含人造色素．

解答 答案：D
解析：A：商業(yè)的；B：有益的；C：官方的；D：人造的．根據(jù)句意"該產(chǎn)品僅使用了自然物質(zhì)，不含人造色素"及所給選項(xiàng)分析可知，本題答案為D選項(xiàng)；其余選項(xiàng)均不符合題意．

點(diǎn)評(píng) 本題考查形容詞的辨析，做此類題目時(shí)一定要清楚各個(gè)選項(xiàng)的含義及用法，再結(jié)合句意其其它要求確定最終的答案．

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