When filled with a gas______ lighter than air a balloon becomes buoyant and rises.A.muchB

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When filled with a gas______ lighter than air, a balloon becomes buoyant and rises.

A.much

B.more

C.less

D.little

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。