1. Talk to anyone in the drug industry, you’ll soon discover that the science of genetics is the biggest thing to hit drug research since penicillin was discovered.
[A] or [B] so [C] for [D] and
2. Had Paul received six more votes in the last election, he ________ our chairman now.
[A] must have been [B] would have been
[C] were [D] would be
3. Stressful environments lead to unhealthy behaviors such as poor eating habits, which ________ increase the risk of heart disease.
[A] in turn [B] in return
[C] by chance [D] by turns
4. The tourist is prevented from entering a country if he does not have ________ passport.
[A] an operative [B] a valid
[C] an efficient [D] an effective
5. The project requires more labor than ________.
[A] has been put in [B] have been put in
[C] being put in [D] to be put in
参考答案：DDABA
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