Question

You have never seen 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（经受得住）almost any disaster makes them seem like something out of a magic 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（装置）was completely redesigned and moved to the back of the plane-the area least affected bu 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 massive force and temperatures up to 2,000℉.When in deep water,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.In Paragraph 1，the author wants to say the black box_________.

A. comes from a comic book B. is an necessary device on an airplane

C. can prevent disasters D. can control the function of an airplane

2.From the black box on the Yemeni airliner _________ could be found.

A. the scene of the crash and the degree of the damage B. the total number of passengers on board

C. homing signals sent by the pilot before the crash D. data for analyzing the cause of the crash

3.Why was the black box redesigned in 1965?

A. The early models often got damaged in the crash. B. New materials became available by that time.

C. Too much space was needed for its device. 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. They have stopped sending homing signals. B. There is an urgent need for them to be reconstructed.

C. There is still a good chance of their being recovered. D. They were destroyed somewhere near Brazil.

Answer 1