选择题：NO有毒，在空气中极易与氧气反应生成NO2，造成空气污染．但少量的NO在人体内具

题型：阅读理解

阅读理解。

Americans with small families own a small car or a large one. If both parents are working, they usually

have two cars. When the family is large, one of the cars is sold and they will buy a van (住房汽车).

A small car can hold four persons and a large car can hold six persons but it is very crowded. A van

hold seven persons easily, so in a family three children could ask their grandparents to go on a holiday

travel. They could all travel together.

Mr. Hagen and his wife had a third child last year. This made them sell a second car and buy a van.

The sixth and seventh seat are used to put other things, for a family of five must carry many suitcases

(衣箱) when they travel. When they arrive at their grandparents' home, the suitcases are brought into the

two seats can then carry the grandparents.

Americans call vans motor homes. A motor home is always used for holidays. When a family are

traveling to the mountains or to the seaside, they can live in their motor home for a few days or weeks.

All the members of a big family can enjoy a happier life when they are traveling together. That is why

motor homes have become very popular. In America there are many parks for motor homes.

1. From the passage, a van is also called _____. 　　 [ ]

A. a motor car 　　

B. a motor home 　　

C. a motor bike 　　　

D. a big truck

2. Before Mr. Hagen and his wife bought a van, they _____. 　　 [ ]

A. sold their old house 　　　　　　　　

B. moved to their grandparents' house 　　

C. built a new place for a van 　　　　　

D. sold their second car

3. A motor home is usually owned by a family with _____. 　　[ ]

A. a baby 　　

B. much money 　　

C. more than two children 　　

D. interest in vans

4. Americans usually use motor homes _____. [ ]

A. to travel with all the family members for holidays

B. to do some shopping with all the family members

C. to visit their grandparents at weekends

D. to drive their children to school every day

5. Motor homes have become popular because _____.　　 [ ]

A. they can take people to another city when people are free

B. they can let families have a happier life when they go out for their holidays

C. some people think motor homes are cheap 　

D. big families can put more things in motor homes

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题型：单项选择题

个体工商户吴三在2000年5月至 2001年2月期间，采用虚假纳税申报的手段偷税共计9000余元。甲区税务局在2001年 4月对其进行了查处，在充分调查其日常经营账目和对其进行询问的基础上，依据《税收征收管理法》的有关规定对其作出了罚款 5000示的决定。吴三不服向市税务局申请复议。甲区税务局在收到申请书副本10日内，未提出书面答复，也未提交作出处罚决定的证据等有关材料。市税务局对此应作的处理决定是：

A．以处罚决定事实清楚为由，决定维持，

B．以处罚决定适用法律正确为由，决定维持

C．通知甲区税务局并限期举证

D．视为处罚决定没有证据、依据，决定撤销

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题型：选择题

如图所示，AB是一质量为m的均匀细直杆，A端靠在光滑的竖直墙壁上，B端置于水平地面上，杆身与竖直方向夹角为θ，杆与地面的摩擦系数为μ，保持平衡，则此时杆与地面的摩擦力为（　　）

A．mgtgθ