These planes are designed to travel at ______ speeds.

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问题 These planes are designed to travel at ______ speeds.

选项 A、sounding
B、fatal
C、supersonic
D、soaring

答案C

解析 形近识别A.sounding发出声音的;B.fatal致命的;C.supersonic超音速的,超音波的;D.soaring高飞的,翱翔的;因此选项C为答案。
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