配气机构的布局形式有（）两种。 A.底置气门式和侧置气门式 B.顶置气门式和侧置气门

阅读理解。

    "Visitors to the 2010 World Expo in Shanghai will be able to go sightseeing in super cool cars with no

drivers," Shanghai city officials (官员) said recently.

     When a prototype (样品) of the six-seat car was shown to the public, it interested many people. "The

car will help visitors feel what high technology (科技) is and help them enjoy the tour of the World Expo

site," said a professor from Tongji University. The prototype, 4.5meters long, 1.7 meters wide, and 1.6

meters tall, runs along a white line. The car costs around 300,000 yuan to build and can reach a top speed

of 50 kilometers per hour.

     According to the researchers, visitors will be able to drive the car anywhere in the World Expo site by

pressing a button. If they want to get off or stop the car, all they need to do is just to press the button again.

     "People can rent one of these cars for a whole day or just take a ride in it from one place to another,"

the professor said. About 400 to 500 of these cars will be made for the Expo in 2010. The cars will have

radar (雷达) to help them get around. They will mainly use solar (太阳能) batteries (电池) and lithium (锂)

batteries. As they have no need of drivers and oil, these cars will help save energy and human labor, and

cause no pollution to the environment.

1. ______ people can take the car at a time. [ ]

A. Four

B. Five

C. six

D. Seven

2. From the second paragraph, we can know the car ______. [ ]

A. is 4.5meters long and 1.6 meters wide

B. runs along two white lines

C. costs about 30,000 yuan to build

D. can reach a top speed of 50 kph

3. People can ______ when they want to get off or stop the car. [ ]

A. tell the driver of the car

B. ask other visitors to help them

C. driver the car out of the white line

D. press the button themselves

4. The best title of the passage is "______".[ ]

A. Tour the 2010 World Expo

B. what is high technology?

C. Cool cars with no driver

D. Radar first used in cars

南美洲西部是高大的_________山地，东部________和________（地形）相间分布。

首选用于治疗癫痫病肝肾阴虚证的方剂是

A．定痫丸

B．左归丸

C．右归丸

D．镇肝熄风汤

E．通窍活血汤

当以生活污水为中水水源时，主要是去除原水中的( )。

A．有机物

B．漂浮物

C．无机物

D．悬浮物

感染手术安排的要求是什么？