大学英语大学英语大学英语六级(CET6)2005年1月8日大学英语六级(CET-6)真题试卷(B卷)
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                                       Passage ThreeQuestions 18 to 20 are based on the passage you have just heard.

2024-07-09

A.When tests show that they are relatively safe.

B.If they don’t involve any risks.

C.When the urgent need for them arises.

D.If they produce predictable side effects.

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