1.According to the processes described in paragraph 1, what is the relationship between radioactivity and the steam produced by geothermal heat?
A. Geothermally heated steam is produced when water is exposed to radioactivity deep underground.
B. When water is introduced into holes drilled thousands of feet in the ground, it becomes radioactive and turns to steam.
C. Radioactivity heats Earth's interior rock, which in turn can heat water to the point it becomes steam.
D. When a reservoir of steam in subsurface rock is produced by radioactivity, it is said to be geothermally heated.
你的答案：正确答案：C
题目解析：
C 细细节题，问radioactivity和steam的关系，所以找双关键词，分别定位至本段第一句和最后一句，第一句说radioactivity提供了地球的内热，最后一句说水变成蒸汽到达地表，水受热才能蒸汽，而这份热量是geothermal energy提供的，这就是二者的关系，所以答案是C。A的水暴露在radioactive underground时候steam产生没说;B水变成radioactive没说;D的radioactivity产生蒸汽更不靠谱
2.The word "practical" in the passage is closest in meaning to
A. usable
B. plentiful
C. economical
D. familiar
你的答案：正确答案：A
题目解析：
A practical: 实用的，可用的。A是可用的，B是很多的，C是经济的，节约的，D是熟悉的。答案是A的usable。
3.The word "abundant" in the passage is closest in meaning to
A. economical
B. familiar
C. plentiful
D. useful
你的答案：正确答案：C
题目解析：
C abundant: 大量的，充足的。A是经济的，节约的;B是熟悉的; C是许多的，丰富的;D是有用的。根据词意，答案是C的plentiful。
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