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You never see him选择题

[单选题]

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, 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 massive force and temperatures up to 2,000℉. When submerged, 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.


What does the author say about the black box?

  • It ensures the normal functioning of an airplane.
  • The idea for its design comes from a comic book.
  • Its ability to ward off disasters is incredible.
  • It is an indispensable device on an airplane.
正确答案应该选D:黑盒子是飞机上不可缺少的设备。
发表于 2020-05-19 17:16:51 回复(6)
直接看第一句就知道是黑匣子,用常识也知道,黑匣子只是记录信息的呀,并不能抵御灾害!所以根据科学原理来说,是选D
发表于 2022-02-17 10:19:12 回复(0)
第一段中 Their ability to withstand almost any disaster makes them seem like something out of a comic book. (它们承受几乎所有灾难的能力使它们看起来像漫画书中的东西。)说明它们抵御灾难的能力是不可思议、难以置信的,符合C选项。
发表于 2020-10-12 16:49:49 回复(0)
黑盒子没有抵御灾害的能力,只是记录的作用
发表于 2022-02-11 15:58:55 回复(0)
选C吧?段落哪里提到D了?
发表于 2022-02-03 18:31:48 回复(0)
同觉得是C,抵御灾害的能力令人难以置信
发表于 2021-09-23 15:30:58 回复(0)
第一段:Their ability to withstand almost any disaster makes them seem like something out of a comic book.说明可以抵御灾难。
发表于 2020-08-30 16:39:12 回复(0)