问题 单项选择题

则S100+S101=()。

A.1

B.-1

C.2

D.-2

答案

参考答案:B

解析:

依题意S100=1-3+5-7+…+197-199+201=-2×50+201=101

S101=1-3+5-7-9…+201-203=-2×51=-102,则S100+S101=-1,选(B).

阅读理解

Reading comprehension.

     Each year, many Chinese people go abroad because of all kinds of reasons. They are becoming younger

and younger year by year. Even some Chinese parents send their children to foreign countries when they are

only in a middle school. They think their children can get a wider view, less academic (学业) competition or

family honor. But life can be bad for young people there. At first, they have to face the culture differences

and language problems. However, these are not always the most difficult things to overcome (克服). To best

children, controlling (管理) themselves well is a big challenge when studying alone in strange country.

     Yu Yang, a 15-year-old student from Guangdong Province studies in a high school in Toronto, Canada.

To his surprise, his teachers there seldom push students to study abroad. And usually there isn't too much

homework. Students have lots of free time to do the activities. Some of his friends spend their whole year's

money in the first two months of the new term. So they have to ask their parents for some more money.

     On the one hand, studying abroad can help students learn foreign languages quickly and en up their eyes,

but on the other hand, some children may feel lonely, become bad, lose themselves, etc. Many problems may

happen to them. These are different from their original thoughts. So parents should think them over before

their children go abroad.

Answer the questions according to the passage.

1. Why do Chinese parents send their children abroad?

    ______________________________________________________________________

2. What do the students have to face in foreign countries at first? 

    ______________________________________________________________________

3. Controlling themselves well is a big challenge, isn't it? 

    ______________________________________________________________________

4. Do students in Canada have more free time than those in China? 

    ______________________________________________________________________

5. What's the article mainly about? 

    ______________________________________________________________________

多项选择题