Study shows that walking fast at your old age is a ___ that you will live a long life.

A. sign B. mark C. symbol D. signal

A

【解析】

試題分析：考查名詞詞義辨析。A標(biāo)志，跡象，征兆；B痕跡；C癥狀；D信號(hào)；句意：研究顯示年老時(shí)快步走是你長壽的征兆。根據(jù)句意說明A項(xiàng)與上下文搭配正確。

考點(diǎn)：考查名詞詞義辨析

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