题目内容
（请给出正确答案）
When was dry ice first made？
A．In the 1920's.
B．In the 1930's.
C．In the 1940's.
D．In the 1950's.
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更多“When was dry ice first made？A．In the 1920's.B．In the 1930's.C．In the 1940's.D．In the 1950'”相关的问题
听力原文： Can you imagine ice that does not melt and is not wet？ Have your 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 hope of its invent or. 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 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.
(33)
A．Chemicals.
B．Vapor.
C．Water.
D．Gas.
听力原文： Can you image ice that 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 adventure. It can be used for making artificial fog in the movies. When steam is passed over dry ice, a very dense vapor rise. 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's 142c colder. Since it turns into steam 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 ff you touch it with you bare fingers, it will burn you.
(26)
A．Chemicals.
B．Water.
C．Gas.
D．Vapor.
Dry Ice
Time of invention:【46】
Uses: to make【47】in the movies;
to destroy【48】
Advantages over ordinary ice: takes【49】be【50】
Dry ice was first manufactured in 1925. It has 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 be cause it takes up less space and is 142 degrees colder. Since it turns into steam instead of melting in to water, it is cleaner to use. For these reasons it is extremely popular, and many people prefer it to ordinary ice.
What is dry ice made of？
A．Chemicals.
B．Vapour.
C．Water.
D．Gas.
听力原文： Can you image ice that 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 adventure. It can be used for making artificial fog in the movies. When steam is passed over dry ice, a very dense vapor rise. 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's 142c colder. Since it turns into steam 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 ff you touch it with you bare fingers, it will burn you.
(23)
A．Chemicals.
B．Water.
C．Gas.
D．Vapor.
The Ice Age
Twenty thousand years ago, the earth was held in control by relentlessly (不宽容地) probing fingers of ice that drew power from frigid strongholds in the north and crept southwestward to bury forests, fields, and mountains. Landscapes that were violated by the slowly moving glaciers(冰川 )would carry the scars of this advance far into the future. Temperatures dropped deeply, and land surfaces in many parts of the world were depressed by the unrelenting weight of the thrusting ice. At the same time, so much was drawn from the oceans to form. these huge glaciers that sea levels around the world fell by three hundred and fifty feet, and large areas of the continental shelf became dry land.
This period of the Earth's history had come to be called the Ice Age. In all, about eleven million square miles of land were covered with ice. The Ice Age terminated about fourteen thousand years ago when the ice sheets began to retreat. It took about seven thousand years for the ice to retreat to its present level.
There were no human beings on the earth during the Ice Age.
A．Right
B．Wrong
C．Not mentioned
A. we want to be healthy and strong
B. we want to enjoy our food
C. we want to eat more
D. we want to save time
How is an artificial fog made in the movies？
A．By passing steam over dry ice.
B．By turning ordinary ice into steam.
C．By melting dry ice.
D．By mixing dry ice with ordinary ice.
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.
A．By turning ordinary ice into steam.
B．By passing steam over dry ice.
C．By heating dry ice.
D．By mixing dry ice with ordinary ice.
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