B
后面的those指代前面的things,意思是因为不同引力作用,火星上的东西比地球上的（东西）轻.
things are on mars on earth becaus of the different gravity
things are on mars on earth becaus of the different gravity
a much lighter b much lighter,than those
a much lighter b much lighter,than those
英语人气：273 ℃时间：2019-12-25 00:23:32
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