单项选择题：具有甾体母核的化合物是 A．蒽醌类化合物 B．黄酮类化合物 C．皂苷类化合物 D．香

题型：单项选择题

It is 40 meters long and 6 meters wide. This must be the biggest bus you have ever seen. It can carry 1,200 to 1,400 people.

It is China’s new Super Bus. It went for a test run in Beijing. Some other cities are also interested in running the Super Bus. They hope it can solve traffic problems.

The Super Bus runs along *fixed tracks. The bus sits on top of two2.2-meter-tall legs. The legs have wheels at one end. Small cars can drive under the bus, so the Super Bus does not take up road space.

The bus runs on *electricity and *solar power. It can travel up to 60 km every hour. Its creator, Song Youzhou, says it can reduce a lot of traffic *jams.

The Super Bus can do the work of 40 buses. In that way, it can save 860 tons of *fuel every year, according to Song.

‘ Building a Super Bus and its track costs less than building subways. Subways are nearly ten times more expensive to build. ’ Song says.

Some people worry that the Super Bus may not be safe. However, Song says there’s no need to worry about that. The Super Bus has *laser *scanners between its legs. The scanners make sure the cars keep a safe distance.

小题1:The Super Bus can carry ___________people.

A． 1,300

B． 1,500

C． 1,700

D． 1,900小题2:Some other cities are also interested in running the Super Bus because they hope it can _____________________________

A．Take the place of small cars

B．Solve traffic problems

C．Increase the speed

D．Reduce car accidents小题3:All the following are the advantages of the Super Bus EXCEPT that ________.

A．The bus doesn’t take up road space

B．The bus can do the work of 40 buses

C．The bus is very easy to build and drive

D．The bus can save a lot of energy every year小题4:According to Song, it’s safe for small cars to drive under the Super Bus because _____.

A．the bus is tall enough

B．the road is wide enough

C．the bus travels up to 60 km per hour

D．there are laser scanners between its legs

查看答案

具有甾体母核的化合物是 A．蒽醌类化合物 B．黄酮类化合物 C．皂苷类化合物 D．香

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