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  3. You never see them, but they’re with you every time you fly. They record whe

You never see them, but they’re with you every time you fly. They record whe

游客2023-07-13  13
问题     You never see them, but they’re with you every time you fly. They record where you’re 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 the Comoros Islands in the Indian 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 model 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). That 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 quarter-inch-thick panels of stainless steel, the boxes can withstand massive force and temperatures up to 2,000°F.  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.
[br] Why does Michelle Obama hold a strong fascination for the author?
选项 A、She serves as a role model for African-America women.
B、She possesses many admirable qualities becoming the First Lady.
C、She will present to the world a new image of African-America.
D、She will pay closer attention to the interests of African-America.
答案 D
解析 推理判断题。本题的答案要从整篇文章来分析。可以使用排除法。选项A)它确保飞机正常运行。根据第一段第二句，They record where you’re going，how fast you’re traveling and whether everything on your airplane is functioning normally．(它们记录你的飞行路线、速度以及你所在的飞机是否一切运转正常。)可知黑匣子的功能是记录而不是确保飞机正常运行，因此不能选。根据文章第一段第三句, Their ability to withstand almost any disaster makes them seem like something out of a comic book. (它们几乎能抵抗一切灾难的能力使之看起来像出自于漫画书中。)可知它的设计并不是出自于漫画书，选项B不符合。选项C(它防止灾难发生的能力非常惊人)，从全文可知黑匣子的功能不是防止灾难发生而是可以记录飞行信息，因此也排除。选项D(它是飞机上不可或缺的装置)符合原文，因此选D。
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