题目内容

A: Thank you very much _____ the roses. They are so lovely!B: I'm glad you like them. They are from my own garden.

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A: Some of the flowers ______ this morning, so beautiful and sweet!B: I know you love flowers, and I hope you'll enjoy keeping them.

Mr. Black: I really feel happy for you. I know you ______ the honor.Mr. Alright: It's very kind of you to say so.

Mr. Black: I’m sure you and your company will be more successful in the coming year.Mr. Alright: Thanks for your kind words. I’m looking ______ to our continued cooperation in the future.

f(x)在[a,b] 的定积分存在的充分条件，不正确的是：

A. f（x)在[a,b] 连续
B. f（x)在[a,b] 单调有界
C. f（x)在[a,b] 只有有限个第一类间断点
D. f(x)在[a,b]之间有第二类间断点