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

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

【答案】D

【解析】考查形容詞。A. common共同的；B. natural自然的；C. ordinary普通的；D. regular有規(guī)律的。句意：他們定期對乳制品進行檢查，以確保它們是高質量的。故選D。

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