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标题: 六级练习2013.11.01 [打印本页]

作者: Rebecca949    时间: 2013-11-1 11:25     标题: 六级练习2013.11.01

[audio]http://sound.yywz123.com/tingbbs/cet6/cet620131101.mp3[/audio]




In order for a chemical to be considered a drug, it must have the capacity to affect how the body works. (1)_________________________. Drugs are approved only after tests have demonstrated that they are relatively safe when used as directed and when their benefits outweigh their risks.
Thus some very dangerous drugs are approved because (2)______________________. Many people suffer ill effects from drugs called side effects, (3)________________________. The human population contains a great variety of genetic variation, but drugs are tested on just a few thousand people.





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作者: iamdengyue    时间: 2013-11-2 01:31

支持下去。。。会认真学习,有用~
作者: susan.sui    时间: 2013-11-4 09:20

***has the power to do this is completely safe
they're necessary to treat serious  illnesses
even though they take the drug exactly as directed.
作者: lbxg    时间: 2013-11-15 10:39

nice
作者: 伊梦青依    时间: 2014-4-28 09:56

stance has a power to do this it completely safe
作者: a58246983    时间: 2014-4-28 11:02

answer




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