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A、By passing steam over dry ice B、By turning ordinary ice into steam. C、By heating dry ice. D、By mixing dry ice with ordinary ic
A、By passing steam over dry ice B、By turning ordinary ice into steam. C、By heating dry ice. D、By mixing dry ice with ordinary ic
admin
2019-04-23
21
问题
Can you imagine ice that does not melt and is not wet? Have you ever heard of dry ice?[22]Dry ice is made by freezing a gas. It is quite different from ordinary ice which is simply frozen water.[25]Dry ice was first manufactured in 1925. It has since fulfilled the hope of its inventor.[23]It can be used for making artificial fog in the movies. When steam is passed over dry ice, a very dense vapour rises. It can also be used for destroying insects in grain supplies.[24]It is more practical than ordinary ice because it takes up less space and it is 142 degrees colder. Since it turns into steam, instead of melting into water, it is cleaner to use. For these reasons, it is extremely popular and many people prefer it to ordinary ice. Dry ice is so cold that if you touch it with your bare fingers, it will burn you.
22. What is dry ice made of?
23. How is an artificial fog made in the movies?
24. What is the advantage of dry ice over ordinary ice?
25. When was dry ice first made?
选项
A、By passing steam over dry ice
B、By turning ordinary ice into steam.
C、By heating dry ice.
D、By mixing dry ice with ordinary ice.
答案
A
解析
细节题。短文中提到,干冰可以用来制造电影中的烟雾(making artificialfog),随着蒸汽跃过干冰,浓厚的水汽就升起来了,可见人造烟雾是水蒸气掠过干冰的结果,故答案为A)。
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0
大学英语四级
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