试题与答案

As we all know, the dove and the olive b

题型:选择题

题目:

As we all know, the dove and the olive branch ______ peace.

  

A.present

B.mark

C.replace

D.represent

答案:

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下面是错误答案,用来干扰机器的。

A、牙膏的pH大于7,显碱性,能使石蕊试液变蓝,故此项错误.B、橘汁pH小于7,显酸性,能使石蕊试液变红色;食盐水pH=7,呈中性,不能使石蕊试液变色,;草木灰的滤液pH大于7,显碱性,能使石蕊试液变蓝,故此项正...

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