网址:http://m.1010jiajiao.com/timu3_id_2509309[举报]
You never see him, but they’re with you every time you fly. They record where you are going, how fast you’re traveling and whether everything on your airplane is functioning normally. Their ability to withstand almost any disaster makes them seem like something out of a comic book. They’re known as the black box.
When planes fall from the sky, as a Yemeni airliner did on its way to Comoros Islands in the India ocean June 30, 2009, the black box is the best bet for identifying what went wrong. So when a French submarine (潜水艇) detected the device’s homing signal five days later, the discovery marked a huge step toward determining the cause of a tragedy in which 152 passengers were killed.
In 1958, Australian scientist David Warren developed a flight-memory recorder that would track basic information like altitude and direction. That was the first mode for a black box, which became a requirement on all U.S. commercial flights by 1960. Early models often failed to withstand crashes, however, so in 1965 the device was completely redesigned and moved to the rear of the plane – the area least subject to impact – from its original position in the landing wells (起落架舱). The same year, the Federal Aviation Authority required that the boxes, which were never actually black, be painted orange or yellow to aid visibility.
Modern airplanes have two black boxes: a voice recorder, which tracks pilots’ conversations, and a flight-data recorder, which monitors fuel levels, engine noises and other operating functions that help investigators reconstruct the aircraft’s final moments. Placed in an insulated (隔绝的) case and surrounded by a quarter-inch-thick panels of stainless steel, the boxes can withstand(抵挡)massive force and temperatures up to 2,000℉. When submerged(潜入水中), they’re also able to emit signals from depths of 20,000 ft. Experts believe the boxes from Air France Flight 447, which crashed near Brazil on June 1,2009, are in water nearly that deep, but statistics say they’re still likely to turn up. In the approximately 20 deep-sea crashes over the past 30 years, only one plane’s black boxes were never recovered.
1.What does the author say about the black box?
|
A.It ensures the normal functioning of an airplane. |
|
B.The idea for its design comes from a comic book. |
|
C.Its ability to ward off disasters is incredible. |
|
D.It is an indispensable device on an airplane. |
2.. What information could be found from the black box on the Yemeni airliner?
|
A.Data for analyzing the cause of the crash. |
|
B.The total number of passengers on board. |
|
C.The scene of the crash and extent of the damage. |
|
D.Homing signals sent by the pilot before the crash. |
3. Why was the black box redesigned in 1965?
|
A.New materials became available by that time. |
|
B.Too much space was needed for its installation. |
|
C.The early models often got damaged in the crash. |
|
D.The early models didn’t provide the needed data. |
4. What do we know about the black boxes from Air France Flight 447?
|
A.There is still a good chance of their being recovered. |
|
B.There is an urgent need for them to be reconstructed. |
|
C.They have stopped sending homing signals. |
|
D.They were destroyed somewhere near Brazil. |
查看习题详情和答案>>
Mrs Leonard was round and pretty, with shining brown hair and warm, dark, 7 eyes. Everyone adored (敬重) her. But 8 came to love her more than I did. And for a 9 reason.
The time came for the 10 tests given at our school. I could only just hear out of one ear, and was not 11 to reveal something else that would single 12 out as different. So I cheated.
The “whisper test” 13 each child to go to the classroom door, turn sideways, close one ear with a finger, 14 the teacher whispered something from her desk, 15 the child repeated. Then the same for the other ear. Nobody checked how tightly the 16 ear was covered, so I only pretended to block mine.
As 17 I was the last. But all through the testing I 18 what Mrs Leonard might say to me. I knew from previous years that the teacher 19 things like “The sky is blue.” Or “Do you have new shoes?”
My 20 came. I turned my bad ear toward her, 21 the other just enough to be able to hear. I waited and then came the words that God had surely put into her mouth, 22 words that changed my life 23 .
Mrs Leonard, the teacher I 24 , said softly, “I 25 you were my little girl.”
1 A. liked B. loved C. hated D expected
2. A. lip B. ear C. finger D. eyes
3. A. broken B.cut C. formed D.killed
4. A. very B.much C. more D.even
5. A. strange B.happy C. sad D.different
6. A. inside B.with&nbtsp; C. as well as D.outside
7. A. surprised B.smiling C.frightening D.blind
8. A. everyone B.no one C. anyone D.none
9. A. special B.strange C. usual D.simple
10. A. arithmetic算术 B.history C. hearing D. blood
11. A. excitedly B.when C. about D.how
12. A. me B.Mrs Leonard C. us D.the pupils
13. A. encouraged B.persuaded C.required D.agreed
14. A. if B.so C.as if D.While
15. A. that B.what C. after D.which
16. A. untested B.left C.bad D.tested
17. A. usually B.follows C.usual D.well
18. A. examined B.wondered C.understood D.noticed
19. A. questioned B.announced C.shouted D.whispered
20. A. teacher B.time C.opportunity D.chance
21. A. picking up B.plugging up C.closing D.opening
22. A. seven B.some C.several D.lovely
23. A. sometimes B. usually C.forever D.all
24. A. knew B.adored C. realized D.spoke
25. A. expect B.wish C.wanted D.knew
查看习题详情和答案>>
Tong Shiqiang rushed into a kindergarten behind his primary school several times, carrying a __1__ of kids each time he rushed out of their classroom on that fateful(灾难的)day. Only 14 years old and 1.5 m tall, Tong can now__2__ a national bravery award for saving seven children.
The grade-6 student was__3__ a Chinese language class in Zhongwang Primary School in Qishan village of Longnan city, one of the worst-hit areas in Gansu province, __4__ the deadly quake struck on May 12,2008. There were 49__5__ students in his class at the time.
“Window panes began rattling(嘎嘎响)and it __6__ lots of bees were singing underground,”__7__ Tong Shuangxi, Tong Shiqiang's teacher and uncle. “The sound grew__8__...and then I__9__it was an earthquake.”
The teacher cried: “ __10__ out.” All the students ran out of the room immediately.
__11__ outside, Tong Shuangxi rushed toward the kindergarten where the children __12__a nap. Tong Shiqiang ran with him.
Only three of the kids had __13__ to run out of their room when they__14__ the building. The rest were crying, too __15__ to move. It __16__ less than three minutes for them to carry out all the five- and six-year-olds to __17__.
__18__ whether all the kids had been saved, Tong and his nephew had __19__ begun checking the rolls when the classroom's walls fell down. “That's the only time I was scared,” said Tong Shiqiang.
The 14-year-old is __20__ to be nominated (提名) for the child hero award, to be given by the Ministry of Education and the Central Committee of the Chinese Communist Youth League.
1.A.couple B. dozen C. lot D. number
2.A.find B. give C. show D. win
3.A.listening B. hearing C. attending D. giving
4.A. while B. when C. where D. which
5.A. other B. another C. others D. the other
6.A. looked B. seemed C. appeared D. turned
7.A. remembers B. remains C. reminds D. remarks
8.A. alouder B. weaker C. louder D. clearer
9.A. thought B. found C. realized D. recognized
10.A. Nobody B. Anybody C. Somebody D. Everybody
11.A. After B. Before C. Since D. Once
12.A. had B. have C. were having D. having had
13.A. tried B. managed C. wanted D. wondered
14.A. arrived B. got C. reached D. escaped
15.A. frightened B. moved C. surprised D. excited
16.A. took B. spent C. carried D. paid
17.A. hospital B. classroom C. yard D. safety
18.A. Not sure B. No wonder C. No problem D. Not nearly
19.A. even B. ever C. never D. just
20.A. lovely B. friendly C. kindly D. likely
查看习题详情和答案>>Robert Moody, 52, is an experienced police officer. Much of his work involves dealing with __1__,an gang (团伙)problems in the schools of his community. Knowing that many kids often __2__ trouble, he decided to do something about it. So in 1991 he began to invite small groups of kids to go fishing with him on his day __3__.
Those fun trips had a(n) __4__ impact. A chance encounter in 2000 proved that. One day, __5__ working security at a school basketball game, Moody noticed two young guys __6__. He sensed trouble between them. __7__ one of them headed toward Moody and gave him a hug.“I __8__ you. You took me __9__ when I was in fifth grade. That was one of the __10__ days of my life.”
Deeply touched by the boy's word, Moody decided to create a foundation(基金会)that __11__ teenagers to the basics of fishing in camping programs. “As a policeman, I saw __12__ there was violence, drugs were always behind it. They have a damaging __13__ on the kids,” says Moody.
By turning kids on to fishing, he __14__ to present an alternative way of life, “When you're sitting there waiting for a __15__,”he says, “you can't help but talk to each other, and such __16__ can be pretty deep.”
“Talking about drugs helped prepare me for the peer(同龄人)pressures in high school,” says Michelle,17, who __17__ the first program. “And I was able to help my little brother __18__ drugs.”
Moody faces __19__in three years, when he hopes to run the foundation full-time.“I'm living a happy life and I have a responsibility to my __20__ to give back,” Moody says.“If I teach a kid to fish today, he can teach his brother to fish tomorrow.”
1. A. drinking B. drug C. security D. smoking
2. A. ran into B. got over C. left behind D. looked into
3. A.ahead B. away C. off D. out
4. A.immediate B. damaging C. limited D. lasting
5. A.once B. while C. since D. until
6. A.quarreling B. complaining
C. talking D. cheering
7. A.Slowly B. Suddenly C. Finally D. Secretly
8. A.understand B. hear C. see D. remember
9. A.fishing B. sailing C. boating D. swimming
10. A.quietest B. longest C. best D. busiest
11. A.connects B. introduces C. reduces D. commits
12. A.where B. unless C. as D. whether
13. A.impression B. burden C. decision D. impact
14. A.asked B. intended C. pretended D. agreed
15. A.solution B. change C. bite D. surprise
16. A. concerns B. interests
C. conversations D. emotions
17. A. participated in B. worked out
C. approved of D. made up
18. A. misuse B. avoid C. tolerate D. test
19. A. unemployment B. challenge
C. competition D. retirement
20. A. team B. school C. family D. community
查看习题详情和答案>>An interesting new sports in the United States is 1________
sky diving. People like this sport often form a club. 2_______
The members of the club get on airplanes and fly 3_______
highly above the clouds. When it is time, each person 4_______
jumps from the airplane and fall toward the earth at 5_______
very high speed. All of the members have parachutes(降落伞) 6_______
but they do not open the parachutes for long time. Seen 7_______
from the ground they like big birds. The sky divers say 8________
that they sometime feel like birds also. Some people like 9_______
to swim in the ocean and to play in the snow, but the 10__________
favourite place for sky divers is the sky.
查看习题详情和答案>>