The sum of n different positive integers is less than 50．The greatest possible value of n is（　　）
A．10B．9C．8D．7

The following graph shows the air temperature in some place during 24hours in January．
Can you tell me
（1）When was the temperature-3℃？
（2）When was it warmest？
（3）When was the temperature zero？
The Internet has become part of teenage life. There’s a report on 3,375 students aged from 10 to 18 in seven Chinese cities. It says that 38% of them believe they use the Internet often. While most of them get useful information and use the Internet to help in their studies, some are not using it in a good way. Many are playing online games too much. A few even visit Web sites they should not look at. Bad things can happen if young people spend too much time on the Internet.
In order to help young people use the Internet in a good way, a textbook on good Internet behavior has started to be used in some Shanghai middle schools this term. It uses real examples to teach students all about good ways of using the Internet. Some students also make online friends. But if you are meeting a friend offline, let your parents know.
Teachers and parents all think the book is a very good idea. It will teach students how to be a good person in the online world. It will be a guide for teens using the Internet and keep students away from bad sites.
【小题1】The underlined word “it” means_____?
A. the book  B. the report  C. the Internet
【小题2】From the report, about____ students between 10—18 years old  
in the seven cities use the Internet often.
A. 3,375   B. 1,280   C. 2,100   
【小题3】 What do most of the students do on the Internet?
A. They get useful information to help in their studies.
B. They play online games.
C. They make online friends.
【小题4】Why do teachers and parents think the book is a good idea?
A. Because it helps with the students’studies.
B. Because it is used in Shanghai middle schools.
C. Because it teaches students how to use the Internet in a good 
way.
【小题5】Which is  the best title for the passage?
A. The Internet is very useful.
B. Students can't use the Internet.   
C. Be careful when using the Internet.
________ the numbers in employment，the hotel industry was the second largest industry in this country last year.
A．In spite ofB．In case ofC．In terms ofD．In praise of
The research showed beyond        that smoking contributes to heart disease．
A．reachB．powerC．doubtD．problem
The box is so heavy that he can’t lift it.       , he is only a little child.
A．At allB．In allC．First of allD．After all
The children talked so loudly at dinner table that I had to struggle ____.
A．to be heardB．to have heardC．hearingD．being heard
The children talked so loudly at dinner table that I had to struggle ____.
A．to be heardB．to have heardC．hearingD．being heard
The children talked so loudly at dinner table that I had to struggle ____.
A．to be heardB．to have heardC．hearingD．being heard
The children talked so loudly at dinner table that I had to struggle ____.
A．to be heardB．to have heardC．hearingD．being heard
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