有下列物质：甲烷、一氧化碳、氯化钠、稀硫酸、硝酸钾，用物质的化学式填空： （1）

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       Americans love cars.  They go everywhere in them.  85% of people in the US go to and from work

by car.  And most adults have driving liens.  Why does this car culture exist?

       How it started    

       American's love of cars started after the war when soldiers returned home from World War Ⅱ to

rebuild their lives.  They borrowed money from the government to buy houses and cars which became

the symbols of status.  The more money they had, the bigger their cars were.

       Making of roads    

       During the war, President Eisenhower noticed what good roads Germany had.  He did to build new

four-lane roads in America. He said if something happened suddenly, the two-lane roads wouldn't be able to carry all the cars that would suddenly leave the cities.  Car and oil companies liked his idea and build

started.      

       Car loves      

       Not just teenagers are crazy about cars.  Some Americans love their cars so much that they paint their cars beautifullyl These are called Art Cars.  Every April there is an activity in Houston, Texas, where they

show their cars.      

       Pollution      

       Cars have polluted the environment. American President Bush refused a worldwide law that is against pollution. Many countries were angry about it. Bush said he had to think of the American economy and all

the American people that make money from cars. Factories say they want to make cars that pollute

less.  But others say making cars that pollute less will never be as having fewer cars.

1. When did Americans begin to love cars?

A. Before the new two-lane roads were built.               

B. After World War Ⅱ.               

C. During World War Ⅱ.               

D. Before World War Ⅱ.

2. New four-lane roads were built                       .

A. in Germany             

B. by car and oil companies               

C. in America                

D. when something suddenly happened  

3. The underlined word "building" here means "the building of                        ".     

A. companies              

B. soldiers' lives               

C. houses                 

D. roads

4. What were other countries' feelings about Bush's decision?  

A. They agreed with him.     

B. They showed anger to it.               

C. They paid no attention to it.

D. The passage doesn't tell us.

5. The meaning of the last sentence is "                      ".

A. It's better to have fewer cars                   

B. It's better to make cars that pollute less                   

C. It's easier to make cars that pollute less                   

D. It's easier to make people have fewer cars

脑血栓形成的重要危害因素之一（）

A.抽烟史

B.蛛网膜下腔出血史

C.脑出血史

D.短暂脑缺血发作史

E.梅毒史

铝、铁、铜是我们生活中常见的金属．

（1）铝的利用比铜、铁晚是因为金属大规模开发和利用的先后顺序与______有关（填字母）

A．金属的活动性  B．金属的导电性  C．金属在底壳中的含量 

（2）铝具有很好的抗腐蚀性能，原因是______

（3）每年全世界钢铁的产量很高，但钢铁的锈蚀也给人类带来了巨大的损失，铁在空气中锈蚀，实际上是铁跟______和______共同作用的结果；防止铁生锈的方法是______（写一种）；焊接铁制品时，通常先用稀盐酸除去其表面的铁锈，反应的化学方程式为______；

（4）印发铜制电路板的“腐蚀性”为FeCl₃溶液反应，化学方程式分别为①Cu+2FeCl₃=2FeCl₃+CuCl₃；②Fe+2FeCl₃=3X．则②中X的化学式为______．

简述碳化实木地板优点。

地图印刷、装订质量规定，多幅拼图接口裁切允差为______mm。

A．1
B．1.5
C．2
D．3