分析 这篇文章主要介绍了人造卫星不会坠落的原理.火箭把宇航员和人造卫星送入太空,卫星用于通讯、气象监测和研究.在卫星上有两种相反的力量.
解答 答案:61.D 细节理解题.根据第一段第二句The satellites are used for communication,weather monitoring and research.天气卫星用于通信、气象监测和研究.可知没提到D项.故选D.
62.A 推理判断题.根据第二段第三行句子The gravitational pull of the earth (the force which pulls everything towards the ground) is like a rope which keeps the satellite from flying away.地心引力就像可以防止卫星飞走的一根绳子.可知地心引力来自于地球.故选A.
63.A 综合理解题.从根据第二段第一行句子One of them is the force of gravitation (地心引力),which tries to pull the satellite towards the earth.其中一个是地心引力的力量,试图把卫星拉向地球.和根据第二段第三行句子The gravitational pull of the earth (the force which pulls everything towards the ground) is like a rope which keeps the satellite from flying away.地心引力就像可以防止卫星飞走的一根绳子.可知卫星不能飞走是因为地心引力.故选A.
64.B 细节理解题.根据倒数第二行句子As time goes by,the satellite loses its speed,which makes the gravitational pull stronger than the force pulling it away.This makes the satellite crash (坠落) down to the earth.随着时间的流逝,卫星失去它的速度,使地心引力比牵引力更强.这使得卫星坠落到地球.可知当它的速度减慢这颗卫星将最终坠毁到地球.故选B.
65.C 综合理解题.通读全文,根据倒数第二行句子As time goes by,the satellite loses its speed,which makes the gravitational pull stronger than the force pulling it away.This makes the satellite crash (坠落) down to the earth.随着时间的流逝,卫星失去它的速度,使重力比牵引力就更强.这使得卫星坠落到地球.可知A、B、D三项不符合文意,C选项是正确的.故选C.
点评 在通读全文的基础上,根据全文大意,展开逻辑思维,瞻前顾后,认真观察选项,仔细推敲,确定最佳答案.
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