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Most vaccines are derived from weakened or killed strains of the same virus that they prevent, unlike the derivation of smallpox vaccine from a different virus altogether.
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
我有更好的解析 
暂无雷哥网文字解析
考点 比较
most vaccines和small vaccine比较
比较对象不对等排除ADE
C选项's多余
答案B
汪二喵
C 被动语态只能用is，不能用其他系动词
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2018-12-05 14:48:08
Ashinxgy
smallpox vaccine 专用术语，[药] 天花疫苗；牛痘苗；天花菌苗
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2017-10-17 15:36:01
Johnny97
有is表被动 gmat也不能用get表被动
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2017-10-15 09:29:49
科目：
句子改错SC
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句子改错SC -18308
Dinosaur tracks show them walking with their feet directly under their bodies, like mammals and birds, not extended out to the side in the manner of modern reptiles.
句子改错SC -18302
Upon their first encountering leaf-cutting ants in South America, the insects seemed to some Europeans to be carrying bits of greenery to shade themselves from the tropical sun—hence the sobriquet “parasol ants.”
句子改错SC -18297
With near to all tortilla chips made from corn kernels that have been heated in a solution of calcium hydroxide (lime), this removes the skin of the kernel so water can penetrate.
句子改错SC -18284
Many population studies have linked a high-salt diet to high rates of hypertension and shown that in societies where they consume little salt, their blood pressure typically does not rise with age.
句子改错SC -18282
Although the company's executives have admitted that there had been accounting irregularities involving improper reporting of revenue, as well as of failure to record expenses, they could not yet say precisely how much money was involved.
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