若函数y=f(x)在R上单调递减且f(2m)＞f(1+m)，则实数m的取值范围是

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问题选择题

若函数y=f(x)在R上单调递减且f(2m)＞f(1+m)，则实数m的取值范围是[ ]

A．(-∞，-1)

B．(-∞，1)

C．(-1，+∞)

D．(1，+∞)

答案

答案：B

填空题

Fill in the blanks with the proper forms.(用所给单词的适当形式填空。)

1. Look! The tiger is _______ (swim) .

2. I can _______ (make) a snowman.

3. Everyone _______ (like) to get birthday cards.

4. I usually _______ (go) home at 5 o'clock in the afternoon.

5. I'm _______ (clean)the room now.

6. — _______ you ______ (eat) breakfast at 7:00 every day?

— Yes, I do.

7. When is ______ (you) birthday?

8. There are some _______ (sheep)on that farm.

9. They _______ (be) playing football together.

10. I like _______ (read) books.

单项选择题

弓形制动梁两闸瓦托对角扭曲大于（）时修理。

A.5mm

B.10mm

C.15mm

D.20mm