Radar signals and rockets travel through out space are the products of our scien

Radar signals and rockets ________ travel through out space are the products of our ________ scientific age.

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A．are able to; fast-movingB．able to; fastly-movedC．able to; fast-movingD．are able to; fastly-moving

试题答案

答案：C

提示：

able to形容词短语作主语的后置定语，fast可用作形容词，也可用作副词．