问题
单项选择题
曲线y=x2，x=2，y=2，y=0所围成的图形的面积为（）．
A．4
C．6
D．1
A.A
B.B
C.C
D.D
答案
参考答案：B
解析：
如右图所示，阴影部分的面积即为所求，由定积分的几何意义知，[*]，故选B．
[*]
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曲线y=x2，x=2，y=2，y=0所围成的图形的面积为（）．
A．4
C．6
D．1
A.A
B.B
C.C
D.D
参考答案：B
解析：
如右图所示，阴影部分的面积即为所求，由定积分的几何意义知，[*]，故选B．
[*]
| 短文填空。用方框中所给单词的适当形式填空，使短文完整正确。（每个单词限用一次） | |
their children won't know the money 1 from hard work. Some parents like to 2 birthday parties for their children. If they keep on doing this, their children will think it 3 for them to enjoy birthday parties every year. Year after year, maybe they will forget their 4 birthdays and only remember their 5 . It is against traditional habits. Many parents don't let the children do housework. They think children have only one thing to do. They should study hard and do 6 in their lessons. If parents go on doing this, the children will only learn to open their mouths to be fed and stretch out (伸出) their arms to be 7 every day. When the children grow up, they will be able to do 8 , and they won't even find a 9 . Parents should teach the children 10 to do housework because it can help them start good habits of working by themselves. | |
| 1. _____ 2. _____ 3. _____ 4. _____ 5. _____ 6. _____ 7. _____ 8. _____ 9. _____ 10. _____ |