But still there is a danger that grow
s every year．Airliners get larger．Some airplanes can hold over 300 passengers．And the air itself becomes more and more crowded．If one giant airliner crashed into another in mid-air, 600 lives could be lost．．Air traffic controllers tell the pilot exactly when to turn, when to climb, and when to come down．The air traffic controllers around a busy airport like London-Heathrow may handle 2500 planes a day．Not all of them actually land at the airport．Any plane that flies near the airport comes under the orders of the controllers there．
Recently such a disaster almost happened．One, with 69 passengers, had come from Toronto, and the other, with 176 passengers, from Chicago, An air traffic controller noticed on his radar screen that the two planes were too close to each other．He ordered one to turn to the right and to climb．But he made a mistake．He ordered the wrong plane to do this．Fifteen seconds later it flew directly in front of the second plane．They avoided each other by the smallest part of a second．The distance between them was less than that of a large swimming pool.
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| A．Even a small mistake on their part could cause a disaster． |
| B．Two large jets were flying towards the airport． |
| C．Nowadays people like traveling more by air than by car． |
| D．Today, air travel is far safer than driving a car on a bus motor-way． |
E． This is an example of the danger that grows every year．
F． In a word, air travel is more dangerous, we should choose others．
G． From the moment an airliner takes off to the moment it lands, every movement is watched on radar screen．
Rivers are one of our most important natural resources. Many of the world’s great cities are located on rivers, and almost __1_______ country has at least one river __2_______(flow) through it that plays __3________ important part in the lives of its people.
Since the beginning of history, people _4______________ (use) rivers for transportation. The longest one in the United States is the Mississippi, and the lifeline of Egypt is the Nile. __5_____________ transportation, rivers give water to drink, water for crops, and chances for fun and recreation （消遣，娱乐活动）for the people __6________________ live along their banks.
However, large cities and industries that are located on rivers often make problems. As the cities grow __7____________ size and industries increase in number, the water in the rivers becomes __8_____________ (pollute) with chemicals and other materials. People come to kwon the __9_____________ (important) of doing more to keep their rivers clean __10_____________ they want to enjoy the benefits of this natural resource.
The Internet has become part of young people’s life. _1. _______ report shows that 38% of students often use the Internet. Most of them get _2.________ (use) information on the Internet _3._______ use the Internet to help with their studies. But many students don’t use it _4.________ a good way. Some play games too much, and some visit websites __5.__________ shouldn’t look at. So bad things may happen __6._________ students spend too much time on the Internet.
__7._______ is important for students to use the Internet properly. Now we have a textbook, __8._______ uses many examples to teach students some good ways to use the Internet. It gives useful __9._______(advise).
Some students also make friends on the Internet. But if you want to have a face-to-face _10.__ ______ (meet) with your online friends, please let your parents know and meet in a proper place.
Soon after Dave left college, one of his uncles, 1 was rich and had no children of his own died and 2 (leave) Dave a lot of money, so he decided to set up his own real estate agency(地产公司).
He found a nice office, 3 (buy) some new furniture and moved in. He had only been there for a few hours when he heard someone coming 4 the door of his office.
“It’s my first customer!” he thought. He quickly picked up 5 telephone and pretended to be very busy 6（answer）an important call from someone in New York 7 wanted to buy a big and expensive house in the country.
The man knocked at the door 8 this was going on, came in and waited 9 (polite) for the agent to finish his conversation. Then he said to him, “I’m from the telephone company, and I 10 (send) here to connect your telephone.”
Experiments have proved that children can 1 (instruct) in swimming at a very early age. At a special swimming pool in Los Angeles, children become expert at 2 (hold) their breath under water even before they can walk. 3 (baby) of two months old do not appear to be reluctant to enter the water. It is not long 4 they are so accustomed to swimming 5 they can pick up weights from the floor of the pool. A game that is very popular with these young 6 (swim) is the underwater tricycle race. Tricycles are lined up on the floor of the pool seven feet under water. The children compete against each other to reach the other end of the pool. Many pedal their tricycles, 7 most of them prefer to push or drag them. Some children 8 cover the whole length of the pool 9 coming up for breath even once. Whether they will ever become future Olympic champions, only time will tell. Meanwhile, they should encourage 10 among us who cannot swim five yards before they are gasping for air.
Thirty-two people watched Kitty Genovese 1 (kill) right below their windows. She was 2 neighbor. Yet 3 of the 32 helped her. Not one even called the police.
John Barley and Bib Fatane went beyond the headlines to research into the reasons 4 people didn’t act. They found that a person has to go through two steps 5 he can help. First he has to notice that it is 6 emergency(紧急情况). Is the smoke coming into the room 7 a leak in the air conditioning? Is it “steam pipes”? Or is it really smoke from a fire? It’s not always easy to tell if you are faced with a real emergency. Second, and 8 important, the person faced with an emergency must feel personally 9 (responsibility). He must feel that he must help, 10 the person won’t get the help he needs.