题目列表(包括答案和解析)
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 tr
affic, 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 |
| A．the red light appears | B．the red light turns yellow |
| C．the yellow light appears | D．the green light turns red |
| 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% |
| A．the red light | B．the truck that needs repairing |
| C．the traffic | D．the truck that is fixing the road |
| A．giving reasons and results | B．giving examples and explaining them |
| C．describing what he thinks | D．asking and answering questions |
Could you please help me _________ the map on the blackboard?
|
A．put off |
B．put up |
C．put out |
D．put on |
Nat lived in a small town in England. He always stayed in England for his vacation, but last year he thought, “I’m never outside this country. All my friends go to Spain , and they like it very much. So this year I’m going there, too.”
First he went to Madrid (马德里) and stayed in a small hotel for a few days. On the first morning he went out for a walk. In England people drive on the left, but in Spain they drive on the right. Nat forgot about this and when he was crossing a busy street, a bike knocked (撞) him down.
Nat lay (躺) on the ground for a few seconds and then he sat up and said,
“Where am I ?”
An old man was selling maps at the side of the street, and he at once came
to Nat and said, “Map of the city, sir ?”
【小题1】Nat always spent his vacation______ .
| A．in Madrid | B．in Spain | C．outside his country | D．in England |
| A．England | B．London | C．Spain | D．America |
| A．忙碌的 | B．紧张的 | C．热闹的 | D．热烈的 |
| A．Do you have a map of the city |
| B．Show me a map of the city, please |
| C．Do you want to buy a map of the city, sir ? |
| D．Do you want to have a look at the map of the city |
| A．sad | B．happy | C．interesting | D．boring |
用所给词的适当形式填空，其中有两项是多余的。
|
busy, small, big, interesting, clear, quite, for |
Our school is in a 1. town. You can’t find it on the map. In our school there is an 2. garden. In the middle of the garden there is a 3. apple tree. After class the 4. students often have a rest under it. Near the garden there is a library. You can read the books in the reading room, But you must be 5. in it and keep the room clean.
On June 26, 2000, two scientists, called Francis Collins and Craig Venter, told the world that they could read the whole “map” of the human body: DNA. DNA is something that everybody has, and it tells the body what to do. DNA is the reason that we look like our mother and father, because we get some of their DNA to make our own.
People have been trying to understand the human body for a long time. In 1860, Gregor Mendel discovered a special reason why we look the same as other people in our family. It is because of small things named “genes” in our body. In 1953, James Watson and Francis Crick made another discovery and found out that those small parts are real messages written in the DNA with a special language.
In 1961, Marshall Nirenberg and Johann Matthaci found a message in DNA showing how DNA tells the cell（细胞）to build its parts. Scientists have now found all the words in the DNA map, but we still do not understand what they all do. By understanding what just one “word” means, we can help save more people from several illnesses.
Most people hope that this will help make better medicine and help sick people. Other people worry that when people begin to know more words and find out lots of other information, we might use it in a wrong way, just to make people more attractive, or stop sick people from getting jobs. Man would have to meet a lot of trouble if DNA technic wasn’t limited（限制）in use.
【小题1】When did we first know why we look like other people m our family?
| A．In 1860 | B．In 1953 | C．In 1961 | D．In 2000 |
| A．Make people get new jobs. |
| B．Make medicine for illnesses. |
| C．Make maps of human. |
| D．Make people less attractive. |
| A．It can cause good or bad results. |
| B．It can cause only good results. |
| C．It can cause good results but won’t work. |
| D．It can cause only bad results. |
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