[解析]
(1)E.推理判断题。根据后文" Everything would start floating. "(所有的东西都会漂浮起来),提到了将会发生的情况,所以空白处应该讲的为是在什么情况下会发生下文的情形。根据常识知道这是重力消失的现象,因此前一句应该是假设重力消失,选项E."Imagine that,one day,there was no force of gravity on planet Earth."(想象一下,有一天,地球上没有重力。)与文意相符,故选E.
(2)A.推理判断题。根据前文"Without gravity,the air in the atmosphere has no reason to hang around,and it would immediately leap into space."(没有重力,大气中的空气没有理由停留,它会立刻跃入太空。)提到了重力的作用。后文"The moon doesn't have enough gravity to keep an atmosphere around it,so it's in a near vacuum. "(月球没有足够的引力来保持周围的大气层,所以它处于一个接近真空的状态。)提到月球上没有大气。所以可推知,空白处描述的是月球上存在的问题。选项A."This is the problem the moon has."(这就是月球的问题所在。)符合题意,故选A.
(3)F.推理判断题。根据前文"The moon doesn't have enough gravity to keep an atmosphere around it,so it's in a near vacuum.Without an atmosphere,any living thing would die immediately and anything liquid would boil away into space. "(月球没有足够的引力来保持周围的大气层,所以它处于一个接近真空的状态。没有大气层,任何生物都会立即死亡,任何液体都会蒸发进入太空。)讲述了对没有重力的假设和重力对大气的重要作用,所以此处应该是对前述内容的总结。选项F."In other words,no one would last long if the planet didn't have gravity."(换句话说,如果没有重力,没有人能坚持很久。)符合题意,故选F.
(4)G.细节理解题。根据前文"If gravity were to suddenly double,it would be almost as bad,because everything would be twice as heavy.There would be big problems with anything structural."(如果引力突然加倍,情况也会同样糟糕,因为所有物体的重量都会加倍。任何结构性的东西都会有大问题。)提到了重力加倍对于建筑物来说将会带来大问题,可知后文将叙述具体是什么问题,选项G."Most buildings would collapse fairly quickly if you doubled the load on them."(如果加倍负荷,大多数建筑物都会很快倒塌。)符合题意,故选G.
(5)D.推理判断题。根据前文"What this article shows you is just how necessary gravity is to our world. "(这篇文章向你们展示了,重力对我们的世界是多么的重要。)叙述重力的重要作用,所以下文可以描述没有重力会有什么影响。选项D."We can't live without it,and we can't afford to have it change."(没有它我们活不下去,我们不能让它改变。) 符合题意,故选D.