艾尚托福阅读，我们一起背单词第7期：TPO21-1

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今天我们讲解托福TPO21-1 Geothermal Energy的第1题到第6题需要重点记忆的单词
1. According to the processes described in paragraph 1, what is the relationship between radioactivity and the steam produced by geothermal heat?
题干单词：
radioactivity n. 放射性；辐射性 （高中）
steam n. 蒸汽 （CET4）
geothermal adj. 地热的（托福）
正确答案对应的原文：
Earth’s internal heat, <fueled by radioactivity>, provides the energy <for the plate tectonics and continental drift, mountain building, and earthquakes>. … The water is brought to the surface, <as a liquid or steam>, <through holes drilled for the purpose>.重点单词：
internal adj. 内部的 （CET4）
fuel v. 供以燃料；加燃料 （高中）
plate tectonics 板块构造 （托福）
continental drift 大陆漂移 （托福）
surface n. 表面；表层（高中）
drill v. 钻孔 （高中）
正确选项：Radioactivity heats earth’s interior(adj. 内部的 CET4) rock, which in turn can heat water to the point it becomes steam.

2. The word “practical” in the passage is closest in meaning to
原文：
Geothermal energy becomes available in a practical form (when underground heat is transferred by water)…
重点单词：
practical adj. 可用的；实用的 （高中）
transfer v. 转让；转移；传递 （CET4）
选项单词：
A. usable adj. 可用的 （高中）
B. plentiful adj. 很多的 （高中）
C. economical adj. 经济的；节约的 （高中）
D. familiar adj. 熟悉的 （高中）
practical =usable

3. The word “abundant” in the passage is closest in meaning to
原文：
<By far >the most abundant form <of geothermal energy> occurs <at the relatively low temperatures of 80 to 180 centigrade>.
重点单词：
abundant adj. 丰富的；充裕的 （高中）
centigrade adj. 摄氏度 (高中)
选项单词：
A. economical adj. 经济的；节约的 （高中）
B. familiar adj. 熟悉的（高中）
C. plentiful adj. 丰富的；许多的 （高中)
D. useful adj. 有用的 （高中)
abundant = plentiful

4. According to paragraph 2, which of the following is true about heat reservoirs with a temperature in the range of 80 to 180 centigrade?
题干单词：
reservoir n. 水库；蓄水池 （CET4）
正确答案所对应原文：
<By far >the most abundant form <of geothermal energy> occurs <at the relatively low temperatures of 80 to 180 centigrade>.
正确选项：They are more common than reservoirs that have a higher temperature.

5. According to paragraph 3, what is the connection between underground faults and naturally occurring steam.
题干单词：
connection n. 联系；连接 （CET4）
fault n. 断层
正确选项对应原文：
They occur primarily in regions <of recent volcanic activity> <as hot, dry rock; natural hot water;or natural steam>. The latter two sources are limited to those few areas [where surface water seeps down <through underground faults or fractures> to reach deep rocks <heated by the recent activity of molten material>].
重点单词：
primarily adv 主要的 （CET4）
seep v. 渗透 （托福）
fracture n. 断裂 （CET6）
正确选项：underground faults allow surface water to reach deep rocks that are hot enough to turn it into steam.

6. In paragraph 3, why does the author mention that in the 1990s The Geysers was in its third decade of production?
定位答案原文：
This facility was then in its third decade of production and was beginning to show signs of decline, perhaps because of over development.
重点单词：
facility n. 设施；设备 （CET4）
decline n./v. 下降；衰退 （高中）
正确选项：to help explain the signs of decline shown by the Geysers.

非常开心能跟大家一起分享背单词，我是艾芳如，我们下次再见！