The ________ on Mars is about three-eighths of that on the Earth.

A. gravity B. food C. quality D. weight

A 【解析】句意:火星上的重力大約是地球上的八分之三?疾槊~辨析題。A. gravity重力,指地心引力B. food食物;C. quality質(zhì)量,強(qiáng)調(diào)品質(zhì);D. weight重量。根據(jù)句意語(yǔ)境,可知BCD三項(xiàng)意思都與句意不合,故選A。
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