锁斗泄压速度慢的原因可能是（）。 A.锁斗入口阀泄漏 B.泄压阀有故障 C.泄压管线

Today, more and more students surf the Internet. Whether(是否) students should surf the Internet is a hot topic. Different people have different opinions .Last week, we did a survey about students surfing the Internet. We think maybe it can help you learn a little. The survey below is from the students of No.14 Middle School. One hundred students joined in the survey.

How often they surf the Internet	Once a day	Once a week	Hardly ever
	12%	68%	6%
How long every time	Half an hour	An hour	More than an hour
	26%	57%	17%
What they like doing	Playing games	Studying	Chatting with friends
	64%	22%	14%
Whether they have a best friend online (在线)	Yes	No
	58%	42%
What they think of the Internet	Relaxing	Interesting and helpful(有帮助的)	Dangerous
	60%	22%	3%

 
小题1:Most students spend        on the Internet each time.

A．half an hour

B．an hour

C．more than an hour

D．more than two hours

小题2:Only a few students think the Internet is        .

A．relaxing

B．interesting

C．helpful

D．dangerous

小题3:According to the passage and the survey, we know        .

A．students shouldn’t play games on the Internet

B．parents should let their children go online

C．most students often study on the Internet

D．most students go online just for relaxing themselves