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  3. 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 wheth

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 wheth

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问题     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 Indian ocean on 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 quarter-inch-thick panels of stainless steel, the boxes can withstand massive force and temperatures up to 2000℉. When submerged, they’re also able to emit signals from depths of 20000 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.
Why did the Federal Aviation Authority require the black boxes be painted orange or yellow?
选项 A、To distinguish them from the colour of the plane.
B、To caution people to handle them with care.
C、To make them easily identifiable.
D、To conform to international standards.
答案C
解析 根据第三段倒数第二行the Federal Aviation Authority required that the boxes，whichwere never actually black，be painted orange or yellow to aid visibility．可知之所以把黑匣子染成橘黄色或者金黄色是为了便于察觉，故C正确。
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