命题“对任意的x∈R，x3﹣x2+1≤0”的否定是

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命题“对任意的x∈R，x³﹣x²+1≤0”的否定是（）

A：不存在x∈R，x³﹣x²+1≤0

B：存在x∈R，x³﹣x²+1≤0

C：存在x∈R，x³﹣x²+1＞0

D：对任意的x∈R，x³﹣x²+1＞0

上一题下一题 0.0难度选择题更新时间:2019-08-11 08:37:36

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C

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阅读下列对话，选择正确的答案。
Miss Wang: Good morning, boys and girls! I’m Wang Li. And I’m your（你们的）English teacher（教师）.
Boys and girls: Good morning, Miss Wang!
Miss Wang: This is Helen. She is English（英国人）.
Helen: I’m Helen. Nice to meet you.
Miss Wang: Are you Dale?
Frank: No. I’m Frank.
Miss Wang: OK. Now, Frank, what’s this in English?
Frank: It’s a ruler, Miss Wang.
Miss Wang: What color is it?
Frank: White.
Miss Wang: Right. And what color is this pen?
Frank: It’s blue. I like（喜欢）blue, because（因为）I like the sky（天空）.
Helen: No. The pen is green. And I like green. Look! My jacket is green.
Miss Wang : Great!

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