问题
单项选择题
设曲线L是不经过y=0的区域内的任一封闭曲线，曲线积分
，则t=（）。
A．A
B．B
C．C
D．D
答案
参考答案：A
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设曲线L是不经过y=0的区域内的任一封闭曲线，曲线积分，则t=（）。
A．A
B．B
C．C
D．D
参考答案：A
| 选择方框中的词完成短文。 | |
a park with his friends. They played 4____________. Mike's team won the game, they 5____________ excited. Then they went 6____________ together. In the afternoon, Mike did his 7____________ and 8____________ a book. In the evening, he felt a little 9____________, so he went to 10____________ early. |