随着GRE阅读考试的难度日益增加，大家需要有针对性地进行练习，本文为大家例举的就是逻辑短文的练习，文末还附有答案，供大家更好地练习。
Heat pumps circulate a fluid refrigerant that cycles alternatively from its liquid phase to its vapor phase in a closed loop. The refrigerant, starting as a low- temperature, low-pressure vapor, enters a compressor 5 driven by an electric motor. The refrigerant leaves the compressor as a hot, dense vapor and flows through a heat exchanger called the condenser, which transfers heat from the refrigerant to a body of air. Now the refrigerant, as a high-pressure, cooled liquid, confronts 10 a flow restriction which causes the pressure to drop. As the pressure falls, the refrigerant expands and partially vaporizes, becoming chilled. It then passes through a second
heat exchanger, the evaporator, which transfers heat from the air to the refrigerant, reducing the 15 temperature of this second body of air. (126 words)
1. According to the passage, the role of the flow restriction in a heat pump is to
(A) measure accurately the flow rate of the refrigerant mass at that point
(B) compress and heat the refrigerant vapor
(C) bring about the evaporation and cooling of refrigerant
(D) exchange heat between the refrigerant and the air at that point
(E) reverse the direction of refrigerant flow when needed
答案：C
上文的题目大家答对了几题？大家不仅要多做题，更要善于总结，这样才会有针对性地提高。
>>点击查看GRE阅读专题，阅读更多相关文章！
-
如何两个月拿下GRE？
每年都有无数小伙伴在纠结一个问题，两个月备考GRE到底够不够？事实上，全身心准备的话，完全够了。下面我们一起来看看如何备考，有哪些值得我们学习呢？
- GRE的文章源于哪里?
- GRE考前冲刺复习做到这5点提分最有效
- 2017年GRE考试报名开始啦！最新考试时间官方公布快来抢考位
- ETS官网查不了GRE分数怎么办？