19世纪初使化学成为一门真正的科学的是( )。 A．波义耳 B．拉瓦锡 C．道

下列物质的用途，主要利用了物质的化学性质的是（　　）

A．氮气用作食品的保护气

B．“干冰”用于人工降雨

C．铜用于制造导线

D．生铁铸造铁锅

有下列SQL语句： SELECT 班级名称 FROM 班级 WHERE NOT EXISTS； (SELECT*FROM 学生 WHERE 班级号=班级.班级号) 执行该语句后，班级名称的字段值是( )。

A．计算机 200801 班

B．计算机 200805 班

C．计算机 200801 班和计算机 200805 班

D．没有记录

关于地球大气中臭氧层的叙述中错误的是[ ]

A．氟利昂和含氮废气能导致臭氧层破坏  

B．臭氧层能有效地滤去太阳辐射中的紫外线 

C．南极上空出现的臭氧层空洞是大气污染的结果  

D．臭氧层破坏导致大量紫外线辐射到地面，可减少人类疾病的发生

阅读理解。

     Bushwick is a tough place to grow up. This part of Brooklyn, in New York City, has a lot of crime.

More than half of its 100,000 residents rely on aid from the government. Only 50% of students at

Bushwick High School graduate in four years.

     Some people might say, "We should help these poor kids who have so many challenges." But Malaak

Compton-Rock looks at the teens in Bushwick and says, "Go to help kids who have even bigger challenges

than you do."  She believes that once young people see the power they have to make things better, they

can handle their own problems more easily. So her service group, the Angel Rock Project, took 30 Bushwick

kids to Soweto, in South Africa, to help poor families there. Soweto is a township outside the city of

Johannesburg. The effort, called Journey for Change, aims to show that any kid can change the world.

     "Kids in Bushwick face pressure to drop out of school or become involved in gangs and drugs." Says

Compton-Rock. "We want them to live a life of purpose and service."

     In Soweto, many parents have died of AIDS, a deadly disease. When that happens, a grandparent or a

child must lead the family. The Bushwick volunteers helped such families. They tended vegetable gardens,

cared for babies and bought groceries.

     "The saddest thing was when we visited an orphanage (孤儿院) and I helped a little boy who had been

abandoned because he had HIV, the virus that causes AIDS," says Queen Clyde, 12. "It's been good to be

on this trip. But what's also important is what we do when it's finished. That's what counts." " I never

appreciated what I had until I saw some people who had nothing," says Sadara Lewis, 12 "It's really changed

my attitude. I want to make a difference."

     The trip was two weeks long. But the kids, aged 12 to 15, will spend all year speaking about their

experience, fund-raising and more.

1. What's the main idea of the first paragraph?

A. Bushwick is the poorest place in New York City.

B. Bushwick still needs more care from the government.

C. It is children who suffer most in New York City.

D. Children in Bushwick are living in a bad situation.

2. In Compton-Rock's opinion, the Bushwick kids _____.

A. have few challenges

B. are living much better than people in Africa

C. can learn to deal with their own problems by helping others

D. should be kept out of schools

3. Compared to Bushwick kids, some children in Soweto _____.

A. may have bigger challenges

B. receive no care from the government

C. are much more independent

D. are able to lead the family

4. According to the passage, "Journey for Change" can be best seen as the saying "_____".

A. God helps those who help themselves

B. saying and doing are two things

C. one stone kills two birds

D. a friend in need is a friend indeed

5. From the passage we know that _____.

A. there are few students in Bushwick High School

B. the trip to Soweto will have a long influence in spite of its short time

C. most children are suffering from AIDS in Soweto

D. kids with HIV will be abandoned in Soweto

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