公共英语二级
单选题The author’s primary purpose in this passage is to＿＿＿．
参考答案：A进入在线模考
主旨大意题。本文作者只是客观地对三种药物及相关背景知识作介绍，但是作者并没有着重强调哪一个好哪一个不好，没有作比较。所以正确的答案为A。
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