正确答案: C

事物自身的转化

题目：辩证否定观认为，否定是（ ）

解析：C

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举一反三的答案和解析：

[多选题]

泪腺B．腮腺

汗腺

解析：C,A

[单选题]Henry: Well, I arranged with Bob and Chris to meet me here for a drink, but __________Tom: They are probably held up by the traffic.

neither of them has turned up.

解析：从Tom所说“他俩有可能遇到交通堵塞了(held up by the traffic)”可以推断出他们还没有到达，因此选项C(neither of them has turned up他俩没有一个出现)正确。