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【单选题】
Why did the Federal Aviation Authority require the black boxes be painted orange or yellow?A.
To distinguish them from the colour of the plane.
B.
To conform. to international standards.
C.
To make them easily identifiable.
D.
To caution people to handle them with care.
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noisy; noisy
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must not
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should not
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need not
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cannot
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much too
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too much
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many too
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too many
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too much; too many
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many too; too much
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too many; too much
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