Science has told us so much about the moon that it is quite easy to form an idea of what it would be like to go there. It is certainly not a friendly place. As there is no air or water, there can be no life of any kind. Mile after mile there are only plains(平原) of dust with mountains around them. Above, the sun and stars shine in the black sky. If you step out of the mountains shadows, it will mean moving from terrible cold into great heat. The moon is also a very silent(安静的) world, for sound waves (声波)can only travel through air. But from the moon, you can see a friendly sight(景色). Our earth is shining more brightly than the stars. It looks like a large ball, coloured blue and green and brown.
(   ) 16.What kind of place is the moon?
A. It is a friendly place.             B. It is a lively place.
C. It is a nice place for man to live.    D. It is a lifeless place.
(    ) 17.Temperatures on the moon____.
A. are usually the same everywhere   B. Are always very low
C. can be very different              D. are usually very high
(    ) 18.The moon is a silent world because____.
A. there is no life there              B. there is no air there
C. there is no water there             D. there is not a green tree there
(   ) 19. When we look from the moon, the sky is ____.
A.          blue          B. black         C. green           D. brown
(  ) 20. Mile after mile there are only plains of dust with mountains around them. The word “dust” means “___”.
A. dump (垃圾堆)    B. dry earth (泥土)    C. land       D. field

In Chicago, a computerized system has been developed that controls(管理)traffic on the city’s 235 miles of seven expressways. Now one—a controller—can follow the movement of Chicago’s traffic by looking at a set of lights. The system uses electric sensors(感应器) that are built into each expressway, every half a mile. Several times a second, the computer receives information from each sensor and translates it into green, yellow or red lights on a map in the control room. A green light means traffic is moving forty-five miles an hour, yellow means thirty to forty-five miles an hour, and red means heavy traffic—cars standing still or moving less than thirty miles an hour.
“See that red light near Austin Avenue?”the controller asked a visitor.“That’s a repair truck fixing the road, and the traffic has to go around it.”At the Roosevelt Road entrance to the expressway, the light kept changing from green to red and back to green again.“A lot of trucks get on the expressway there,”the controller explained.“They can’t speed up as fast as cars.”The sensors show immediately where an accident or a stopped car is blocking the traffic, and a truck is sent by radio to clear the road. The system has lowered the number of accidents by 18 percent. There are now 1.4 deaths on Chicago’s expressway for each one hundred million miles traveled, while in other parts of the county there are 2.6.
Traffic experts say that the Chicago system is the “coming thing”.Systems like Chicago’s are already in use on some expressways in Los Angeles and Houston.“Chicago has taken the lead,”said New York City’s traffic director and he added,“Chicago’s a good example.”
根据短文内容，选择最佳答案，并在答题卡上按要求作答。
【小题1】The passage is mainly about ________ on expressways in Chicago.

A．the traffic control system	B．the movement of the traffic
C．the electric sensors	D．the traffic lights

【小题2】When the cars move under 30 miles an hour, ________ on the map in the control room.

A．the red light appears	B．the red light turns yellow
C．the yellow light appears	D．the green light turns red

【小题3】 According to the passage, we may learn __________.

A．some visitors are traveling on the expressway

B．there is no heavy traffic on Chicago’s expressways

C．the traffic on Chicago’s expressways is well managed

D．the number of accidents in the US has dropped by 18%

【小题4】In Paragraph 2 the underlined word “it” refers to ___________.

A．the red light	B．the truck that needs repairing
C．the traffic	D．the truck that is fixing the road

【小题5】The writer writes the article mainly by _________.

A．giving reasons and results	B．giving examples and explaining them
C．describing what he thinks	D．asking and answering questions

In Chicago, a computerized system has been developed that controls(管理)traffic on the city’s 235 miles of seven expressways. Now one—a controller—can follow the movement of Chicago’s traffic by looking at a set of lights. The system uses electric sensors(感应器) that are built into each expressway, every half a mile. Several times a second, the computer receives information from each sensor and translates it into green, yellow or red lights on a map in the control room. A green light means traffic is moving forty-five miles an hour, yellow means thirty to forty-five miles an hour, and red means heavy traffic—cars standing still or moving less than thirty miles an hour.
“See that red light near Austin Avenue?”the controller asked a visitor.“That’s a repair truck fixing the road, and the traffic has to go around it.”At the Roosevelt Road entrance to the expressway, the light kept changing from green to red and back to green again.“A lot of trucks get on the expressway there,”the controller explained.“They can’t speed up as fast as cars.”The sensors show immediately where an accident or a stopped car is blocking the traffic, and a truck is sent by radio to clear the road. The system has lowered the number of accidents by 18 percent. There are now 1.4 deaths on Chicago’s expressway for each one hundred million miles traveled, while in other parts of the county there are 2.6.
Traffic experts say that the Chicago system is the “coming thing”.Systems like Chicago’s are already in use on some expressways in Los Angeles and Houston.“Chicago has taken the lead,”said New York City’s traffic director and he added,“Chicago’s a good example.”
根据短文内容，选择最佳答案，并在答题卡上按要求作答。
【小题1】The passage is mainly about ________ on expressways in Chicago.

A．the traffic control system	B．the movement of the traffic
C．the electric sensors	D．the traffic lights