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发布时间:2024-03-29 03:29:57

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Can you imagine that ice does not melt and is not wet Have you ever heard of dry ice Dry ice is made by freezing a gas. It is quite different from ordinary ice which is simply frozen water. Dry ice was first manufactured in 1925. It has since fulfilled the hopes of its inventor. It can be used for making artificial fog in the movies. When steam is passed over dry ice, a very dense vapor rises. It can also be used for destroying insects in grain supplies. It is more practical than ordinary ice because it takes up less space and it is 142 degrees colder. Since it turns into stream, instead of melting into water, it is cleaner to use. For these masons, 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 bums you.
Dry Ice

Time of invention: (46)
Uses: to make (47) in the movies;
to destroy (48)
Advantages ov

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Can you imagine that ice does not melt and is not wet Have you ever heard of dry ice Dry ice is made by freezing a gas. It is quite different from ordinary ice which is simply frozen water. Dry ice was first manufactured in 1925. It has since fulfilled the hopes of its inventor. It can be used for making artificial fog in the movies. When steam is passed over dry ice, a very dense vapor rises. It can also be used for destroying insects in grain supplies. It is more practical than ordinary ice because it takes up less space and it is 142 degrees colder. Since it turns into stream, instead of melting into water, it is cleaner to use. For these masons, 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 bums you.
Dry Ice

Time of invention: (46)
Uses: to make (47) in the movies;
to destroy (48)
Advantages ov

[单项选择]
Matching Prices to Demand—in Real Time

Can an ice cream shop charge more for a cone on a hot day Should a parking space get (21) as the garage fills up
Boston Consulting Group senior adviser George Stalk believes business can—and should—charge according to (22) The idea builds on a longtime strategy most (23) the airline industry, called yield management, in which carriers (24) prices as planes fill up. The consultant, who in the late 1980s coined the term" time-based competition", the notion that (25) is a strategic weapon, thinks far more companies could take similar steps to match prices to real-time customer demand. Such moves are especially (26) following a year when oil and commodities prices swung wildly, he notes, "companies couldn’t change prices as fast as they needed to. "
Stalk says existing technologies such as radio-frequency identification, GPS, and wireless networks co
A. critical
B. obvious
C. awkward
D. visible

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