设L是连接点A（1，0）及点B（0，-1）的直线段，则对弧长的曲线积_爱下问搜题

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问题单项选择题

设L是连接点A（1，0）及点B（0，-1）的直线段，则对弧长的曲线积分等于（）。

A.-1

B.1

C.

D.-

答案

参考答案：D

填空题

短文填词。

阅读下面短文,根据以下提示:
1)汉语提示,
2)首字母提示,
3)语境提示,在每个空格内填入一个适当的英语单词；
并将该词完整地写在右边相对应的横线上.所填单词要求意义准确,拼写正确.

Sometimes you can learn more about what a person is trying to
say just by watching instead of l    . You might be talking to someone
about an idea you have. He might say that he's interested     your idea.
Just watch his face. Is he l      at you or are his eyes moving around,
just tired of w    you're saying ? It's important to watch other's body
language carefully because it provides a lot of useful       (信息).
Sometimes a person will be speaking too q    or use words that you
don't understand. If you pay attention to the     (信号)he is giving,
maybe you can still follow him, even   you're not sure of the meaning
of the words. This is especially    (有必要的)when watching TV or
in other situations       you can't ask the speaker to slow down.

1.______
2.______
3.______
4.______
5.______
6.______
7.______
8.______
9.______
10.______

问答题

简述规费。