【GMAT考满分阅读RC题库】Solar ponds are bodies of water in which circulati_真题_答案

PREP07 Test 2 - 阅读RC - 12

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题目材料

Solar ponds are bodies of water in which circulation is incomplete and there is a very high salt concentration that increases with depth. This vertical change in salinity serves to trap heat because concentrated brine in the lowest water level acts as a collector and storage area for solar heat, while the less saline, lighter water at the upper levels provides insulation. Heat is thus retained in the depths.

An artificial pond of this type has been constructed on the western shore of the Dead Sea in Israel in order to test its suitability as a source of low-grade heat for conversion into electricity. An immediate threat to the success of the venture was the growth of algae. Water in solar ponds must be kept maximally transparent to allow penetration of light to the deep storage area. Therefore, any particles of matter in the water, such as algae cells, that scatter or absorb light will interfere with the collection of heat.

One proposed method of controlling the algae was the application of an algicide. However, the Dead Sea is a closed body of water without any outlet and as such is very easily contaminated. Extensive use of chemicals in numerous future full-scale solar ponds would lead to such contamination of the Dead Sea, which now enjoys a lucrative tourist trade.

A recent experiment has supplied a more promising method for controlling the algae. To repress the algae cells' capacity for accommodating themselves to environmental changes, the water in the solar pond was first made more saline through evaporation and then diluted by a rapid inflow of fresh water. This shock reduced the cells' ability to regulate the movement of water through their membranes. They rapidly absorbed water, resulting in distortions of shape, increase in volume, and impairment to motility. Their buoyancy adversely affected, the cells sank to the bottom of the pond, where they encountered the hot waters of the storage layer and were destroyed. This method allows for effective control of nuisance algae while leaving solar ponds as one of the cleanest technologies providing energy for human use.

The primary purpose of the passage is to

A describe the unique properties of a solar pond on the edge of the Dead Sea
B report the results of an experiment designed to clean contaminated bodies of water
C detail the processes by which algae cells colonize highly saline bodies of water
D explain the mechanisms by which solar heat may be converted into energy
E discuss ways of solving a problem that threatens to limit the usefulness of an energy source

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正确答案: E

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圣诞157

朋友，答案是E，你分析A对，有问题吧

2018-10-02 18:29:08 IP属地：北京举报

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莫洛mollen 回复圣诞157

他可能是乱序题目，所以ABCD和我们的答案不一样

2020-04-23 23:16:51 IP属地：局域网举报

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约翰在等你回复圣诞157

解析中对A选项分析的内容其实是在讲E选项

2018-11-26 20:45:53 IP属地：北京举报

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叫我Elena

可是选项讲了ways of solving ...这样的话，难道不是应该讲很多解决能源问题的方案？？？可是文章只讲了太阳能啊。。。。

2018-08-29 09:54:45 IP属地：北京举报

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香蕉牛奶001 回复叫我Elena

选项说的是ways of solving a problem 文章第三段one proposed method 第四段 a more promising method 所以是两个

2018-09-05 00:46:15 IP属地：北京举报

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西門

A. discuss (o) / ways of solving a problem (o)
B. solar heat may be converted into energy (x) 文章未提
C. the processes by which algae cells colonize highly saline bodies of water (x) 文章未提
D. experiment designed to clean contaminated bodies of water (x) 文章未提
E. unique properties of a solar pond (x) 非文章重心

2019-12-26 22:08:44 IP属地：局域网举报

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北极星ii

都做完了才发现原来这文章有四段。。。

2020-12-10 14:36:23 IP属地：局域网举报

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嗨嗨安安

怎麼沒啥人討論

2021-12-07 18:06:31 IP属地：局域网举报

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symohonyouo

这种题放第一个好容易错，，做到最后发现前面自己选错了呵呵

2023-09-28 22:04:14 IP属地：河南举报

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正确率： 81%

难度：

选择材料题号

PREP07 Test 2

GWD
PREP07 Test 1
PREP07 Test 2
PREP2012
OG16
OG17
PREP08 Test 1
PREP08 Test 2
Manhattan
Magoosh
OG18
OG18-数学分册
OG18-语文分册
OG19
OG19-语文分册
OG19-数学分册
OG20
OG20-语文分册
OG20-数学分册

SET 1

题目来源

题目来源1:PREP07 Test 2

GMAT 考满分题库