易使碳钢设备内壁腐蚀，生成硫化亚铁类的物质是（）。A、二氧化碳B、硫化氢C、一氧化碳

阅读理解。

     In London, there has always been a main problem. In order to solve this problem, the government has

decided to have a bike revolution (革命). It has decided to provide 6,000 bikes for the people to rent. The

government encourages local people to ride bikes in order to solve the traffic problem.

     More than 12,000 people have agreed to the idea. Some of them ask for more than one key. Although

there are not enough bikes, an official (官员) from the government said that they would find some ways to

deal with such a shortage.

     Local people can get these bikes at special docking stations (停靠站).There are about 315 docking

stations across the city. About 12,450 keys have already been handed out to the local people, but only 6,000

keys can be used now.

     Let's see the cost you need to pay. One key costs ￡3, and the cost of using the bike is ￡1 for an hour.

The cost per hour increases as the hours increase, so it will cost ￡50 if you rent the bike for 24 hours.

     The official from the government said they also needed to face a lot of problems, for example, some bikes

may be lost. But they said they would try their best to solve all the problems to make sure the success of the

program.

1. In London, the government has decided to provide bikes for

   local people to rent in order to solve _________.

A. the traffic problem

B. the population problem

C. the family problem

D. the health problem

2. About _________ keys have already been handed out to the local people.

A. 315

B. 6.000

C. 12.000

D. 12.450

3. In the passage, the underlined word "shortage" means "_________" in Chinese.

A. 挑战

B. 缺点

C. 短缺

D. 困难

4. Which of the following is TRUE according to the passage?

A. The government provides a bike for each family.

B. Local people can get these bikes at special docking stations.

C. If you want a key, you need to pay ￡5.

D. Few people have agreed to the idea.

5. What's the best title for the passage?

A. The people in London.

B. The transportation in London.

C. The traffic problem in London.

D. The bike revolution in London.

不属于政府采购工程咨询服务采购方式的是（）。

A.单一来源

B.邀请招标

C.竞争性谈判

D.直接谈判

缺铁性贫血时细胞形态学分类属于

A．小细胞正色素性贫血
B．小细胞低色素性贫血
C．正细胞正色素性贫血
D．大细胞低色素性贫血
E．大细胞性贫血

某地区2000年原煤产量为4.7万吨，到2004年达到8.5万吨，求此期间该地区原煤产量的年平均增长速度，其算式应是（）。

A.A

B.B

C.C

D.D

公安边防船艇218A巡逻艇的艇首形状为（）

A、飞剪型

B、前倾型

C、球鼻型

D、以上都是