数据库应用系统是在 [4] 支持下运行的计算机应用系统，简称为 [5] 。

某公司8月末负债总额100万元，9月份收回外单位所欠货款15万元，用银行存款归还借款10万元，用银行存款预付购货款5万元，则9月末负债总额为( )万元。

若汽油机飞轮转速为3000r/min，那么，1s内完成______个冲程，活塞往复______次，燃气推动活塞做功______次．

下列叙述中，属于生物的共同特征的是

A．都是由细胞构成的

B．都具有呼吸系统

C．都能进行光合作用

D．都能生长和繁殖

Peter is a sixth-grader at Woodland Primary School. He is only 12 years old but has been smoking for three years. John, 15, is a Junior 2 student at Woodland Secondary School. He began smoking four years ago. “Smoking is part of my life,” John said. Peter and John are not those boys’ real names. But their problem, smoking, is a very real problem. In many countries, smoking is becoming a bigger problem for young people. Most smokers start in their teens or earlier.

A study of 8,000 London students shows that smoking is a problem for many British kids. More than 21% of middle school students and 6 % of primary school pupils said they smoked. “If young people start smoking early, it will be very hard for them to give up later on,” said a professor.

Every year, about four million people die because of smoking. And if people keep smoking,  that number will go up to about ten million a year by 2030, the World Health Organization (WHO) says. So we have to learn and tell others about the dangers of smoking.

小题1:The sentence “Smoking is part of my life” probably means “__________”

A．I don’t smoke very often.

B．Smoking is very important to me.

C．I don’t smoke at all.

D．I’m going to give up smoking.小题2:What will probably happen if a person starts smoking early?

A．He will surely die early.

B．He cannot stop smoking.

C．It will be difficult for him to give up smoking.

D．He will become lazy soon.小题3:The study in the passage shows that __________.

A．smoking is a serious problem among British students

B．there are more and more smokers in England

C．some student smokers are having fun smoking

D．most of smokers are young students小题4:The main idea of this passage is that__________.

A．smoking is becoming a bigger problem for young people

B．more and more people die because of smoking every year

C．WHO asks young people to give up smoking

D．we needn’t worry about the student smokers小题5:As middle school students, what should we do from now on?

A．We should start smoking after middle school.

B．We should ask others to smoke outside.

C．We should laugh at smokers.

D．We should say no to smoking.

在消火栓系统施工中，消火栓箱体安装固定的紧后工序是（）。

A.支管安装

B.附件安装

C.管道试压

D.管道冲洗