According to a recent scientific report, human beings are likely to travel ______ the speed of light in near future.

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问题 According to a recent scientific report, human beings are likely to travel ______ the speed of light in near future.

选项 A、to
B、for
C、at
D、by

答案C

解析 speed速度，迅速，超速，构成短语：with all speed…尽快地；at speed…高速地，快地;at full(top)speed全速；put on speed加快速度。因此答案为[C]。

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