公共英语（PETS）二级考试阅读练习
2017公共英语(PETS)二级考试阅读练习
新的.一轮公共英语考试开始备考中，大家可以多做习题巩固知识，下面是店铺提供给大家关于公共英语(PETS)二级考试阅读练习，希望对大家的备考有所帮助。
古武当山>入团志愿书怎么写
Becau we can feel that things are heavy, we think of weight as being a fixed quality in an object, but it is not really fixed at all. If you could take a one pound packet of butter 4, 000? miles out from the earth, it would weigh only a quarter of a pound. Why would things weigh only a quarter as much as they do at the surface of the earth if we took them 4 000 miles out into space? The reason is this: All objects have a natural attraction for all other objects; this is called gravitational attraction, but this power of attraction between two objects gets weaker as they get farther apart. When the butter was at the surface of the earth, it was 4 000 miles from the centre (in other words the radius(半径)of the earth is 4 000 miles). When we took the butter 4 000 miles out, it was 8 000 miles from the centre, which is twice the distance.
If you double the distance between two objects, their gravitational attraction decreas two times two. If you treble(翻三倍)the distance, it gets nine times weaker(three times three). If you take it four times as far away, it gets sixteen times weaker (four times four)and so on.
1. The best title for this passage is.
[A] The Earth Weight [B] Weight in Space
[C] Changing Weight on the Earth [D] Weight on and off the Earth
2. We can feel things are heavy becau.
[A] weight is a fixed quality in an object
说说致自己成熟霸气[B] they are far away from the centre of the earth
[C] of the earths strong attraction for them
如何垃圾分类
[D] they are not taken away from the surface of the earth宾语从句引导词
be啥意思3. If the distance between two objects is shortened by half, their gravitational attraction will.
[A] double [B] become four times stronger
[C] be the same [D] get four times weaker
素馅水煎包4. If an object weighed one pound 8 000 miles above the earth, it would weigh on the surface of the earth.
[A] 6 pounds [B] 4 pounds [C] 9 pounds [D] 1/9 pound
参考答案：
1.本篇短文介绍的是物体在空中和在地球上重量不同的原因，因此恰当的标题应是D。
紫菜的功效
2.我们之所以能感觉到重量是因为地球引力的原因，答案为C。
3.答案为B
4.C
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