托福阅读如何进行备考?除了大量的托福词汇储备以外，大家可能最需要的就是托福阅读真题的练习。
那么除了TPO你还有哪些托福阅读真题进行练习呢?
今天小编就为大家整理了【托福阅读真题演练100题】系列，今天我们要做演练的阅读真题是水的形成，一起来做做看吧！
托福阅读演练文本：
The geology of the Earth's surface is dominated by the particular properties of water. Present on Earth in solid, liquid, and gaseous states, water is exceptionally reactive. It dissolves, transports,and precipitates many chemical compounds and is constantly modifying the face of the Earth.
Evaporated from the oceans, water vapor forms clouds, some of which are transported by wind over the continents. Condensation from the clouds provides the essential agent of continental erosion: rain. Precipitated onto the ground, the water trickles down to form brooks, streams, and rivers, constituting what are called the hydrographic network. This immense polarized network channels the water toward a single receptacle: an ocean. Gravity dominates this entire step in the cycle because water tends to minimize its potential energy by running from high altitudes toward the reference point, that is, sea level.
The rate at which a molecule of water passes though the cycle is not random but is a measure of the relative size of the various reservoirs. If we define residence time as the average time for a water molecule to pass through one of the three reservoirs — atmosphere, continent, and ocean — we see that the times are very different. A water molecule stays, on average, eleven days in the atmosphere, one hundred years on a continent and forty thousand years in the ocean. This last figure shows the importance of the ocean as the principal reservoir of the hydrosphere but also the rapidity of water transport on the continents.
A vast chemical separation process takes places during the flow of water over the continents. Soluble ions such as calcium, sodium, potassium, and some magnesium are dissolved and transported. Insoluble ions such as aluminum, iron, and silicon stay where they are and form the thin, fertile skin of soil on which vegetation can grow. Sometimes soils are destroyed and transported mechanically during flooding. The erosion of the continents thus results from two closely linked and interdependent processes, chemical erosion and mechanical erosion. Their respective interactions and efficiency depend on different factors.
托福阅读演练题目：
1. The word "modifying" in line 4 is closest in meaning to
(A) changing
(B) traveling
(C) describing
(D) destroying
2. The word "which" in line 5 refers to
(A) clouds
(B) oceans
(C) continents
(D) compounds
3.According to the passage , clouds are primarily formed by water
(A) precipitating onto the ground
(B) changing from a solid to a liquid state
(C) evaporating from the oceans
(D) being carried by wind
4. The passage suggests that the purpose of the "hydrographic network" (line 8) is to
(A) determine the size of molecules of water
(B) prevent soil erosion caused by flooding
(C) move water from the Earth's surface to the oceans
(D) regulate the rate of water flow from streams and rivers
5. What determines the rate at which a molecule of water moves through the cycle, as discussed in the third paragraph?
(A) The potential energy contained in water
(B) The effects of atmospheric pressure on chemical compounds
(C) The amounts of rainfall that fall on the continents
(D) The relative size of the water storage areas
6. The word "rapidity" in line 19 is closest in meaning to
(A) significance
(B) method
(C) swiftness
(D) reliability
7. The word "they" in line 24 refers to
(A) insoluble ions
(B) soluble ions
(C) soils
(D) continents
8.All of the following are example of soluble ions EXCEPT
(A) magnesium
(B) iron
(C) potassium
(D) calcium
9. The word "efficiency" in line 27 is closest in meaning to
(A) relationship
(B) growth
(C) influence
(D) effectiveness
托福阅读参考答案：
AACCD CABD
好了，以上就是小编为大家整理的托福阅读100篇真题练习：水的形成，大家在托福阅读考试进行备考的过程当中也可以拿这些题目来进行练习，相信对于你的托福阅读考试成绩提升会很有帮助。最后，小编预祝大家托福考试能取得理想的成绩。
>>点击查看托福考试内容专题，阅读更多相关文章！
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