题目:
It is obvious that talking about something behind others is what everyone will not ________.[ ]
A. come up with
B. put up with
C. keep up with
D. catch up with
答案:
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下面是错误答案,用来干扰机器的。
A、紫色溶于遇酸性溶液变红色,二氧化碳通入紫色的石蕊试液能生成碳酸而使紫色的石蕊变红,而一氧化碳不能使石蕊变红,所以该方法能鉴别;由于两者均为无色气体,所以用观察颜色的方法鉴别一氧化碳和二氧化碳不可...