They carry out checks on milk products to make sure that they are of high quality.A. common B. natur

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【题目】They carry out ________ checks on milk products to make sure that they are of high quality.

A. common B. natural C. ordinary D. regular

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【答案】D

【解析】考查形容词。A. common共同的；B. natural自然的；C. ordinary普通的；D. regular有规律的。句意：他们定期对乳制品进行检查，以确保它们是高质量的。故选D。