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Many scientists say that the world is getting hotter and hotter．If they are right , the ice at the North and South Pole will melt eventually．If this happens, the sea will 1 and may cover most 2 all of Singapore．This will force everybody to move to a 3 country．
We know that the sun 4 the earth．The heat from the sun hits the 5 , and some of 6 goes back into the sky．However, factories and cars 7 a lot of carbon dioxide（二氧化碳）．When the gas rises into the sky, the heat from the sun can come 8 them but the heat from the ground cannot．It 9 near us in the sky and makes the 10 hotter and hotter every year．
Scientists call this the “greenhouse effect” because a greenhouse is a small glass 11 which is hot inside．It is used for 12 plants in cool countries．Many countries are 13 about the greenhouse effect．They are trying to stop factories and cars from sending 14 gases into the sky．Scientists are not sure when the world will get much hotter．Some people say that the greenhouse effect has 15 already and has begun to affect the world’s weather．
1．A．rise B．fall C．change D．disappear
2．A．and B．or C．but D．till
3．A．better B．larger C．safer D．farther
4．A．shines B．circles C．covers D．heats
5．A．ground B．sky C．mountain D．forest
6．A．them B．it C．those D．such
7．A．make B．spread C．produce D．from
8．A．through B．over C．into D．toward
8．A．hides B．continues C．follows D．stays
10．A．cloud B．air C．season D．temperature
11．A．building B．flat C．tool D．machine
12．A．putting B．storing C．cutting D．growing
13．A．excited B．disappointed C．worried D．pleased
14．A．dangerous B．harmful C．heavy D．useful
15．A．meant B．improved C．started D．stopped
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| Many scientists say that the world is getting hotter and hotter. If they are right, the ice at the North and South Pole will melt eventually. If this happens, the sea will 1 and may cover most 2 all of Singapore. This will force everybody to move to a 3 country. We know that the sun 4 the earth. The heat from the sun hits the 5 , and some of 6 goes back into the sky. However, factories and cars 7 a lot of carbon dioxide (二氧化碳). When the gas rises into the sky, the heat from the sun can come 8 them but the heat from the ground cannot. It 9 near us in the sky and makes the 10 hotter and hotter every year. Scientists call this the "greenhouse effect" because a greenhouse is a small glass 11 which is hot inside. It is used for 12 plants in cool countries. Many countries are 13 about the greenhouse effect. They are trying to stop factories and cars from sending 14 gases into the sky. Scientists are not sure when the world will get much hotter. Some people say that the greenhouse effect has 15 already and has begun to affect the world's weather. | ||||
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| Accidents can happen indoors. Many young children get 1 when playing in their homes. 2 do these accidents happen? A housewife is a 3 person. She has to do most of the work in the home. Sometimes she is 4 . She puts a pot of hot water on a table. A little child can reach it. When she goes out of the room, the child reaches up and 5 the pot. The hot water spills over him and hurts him. Then the child must 6 to hospital at once. Many other accidents happen. Kerosene heaters (加热器) are sometimes 7 by children playing in the home. The kerosene spills out of the heater and burns. Soon the whole room is burning. All things that can cut are dangerous. Sharp knives and scissors should 8 out of reach of children. Small children should not be allowed to 9 them. Electricity is always dangerous. Electricity can be used for heating and cooking, but it can also kill us! You should never touch any electric heaters or wire if it 10 . Medicine makes us 11 or kill us! Sometimes grown-up people are 12 . They leave medicine in places where children can reach it. They find it and eat it. Then they get very ill. Perhaps they die. The skins of bananas, oranges and other 13 are very slippery (滑的). You 14 throw them on the ground. If you do, someone may step on them and fall down. They may break a leg or an arm. To stop accidents, please be 15 in everything you do. | ||||
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100 billion stars in our galaxy, the Milky Way. But the Milky Way is just one of billions of galaxies that we
know about! Some other scientists say there are 2,000,000,000,000,000,000 stars!
The largest star that we know about is called the Pistol Star (手枪星). The PistolStar is closer to the center
of the Milky- May than we are. Because of space dust we can't see it with the naked eye (肉眼). It's about 100
times the size of our Sun, and10,000,000 times as bright as the Sun~
The closest star to the Earth is the Sun! The Sun is about 93 million miles away. We measure bigger
distances in space in light years, and one light year is about6,000,000,000,000 miles. Besides the Sun, Proxima
Centauri (半人马比邻座星) isthe closest star at 4.2 light years away: Some of the brightest stars are more
distant Rigel (参宿七), in the constellation Orion (猎户星座), is the seventh brightest star inthe sky but is 900
light years away. To see the faraway stars, scientists use the Hubble Space Telescope (哈勃空间望远镜).
Hubble has been stars that are 12 billion light years away!
A star's color has a lot to do with its temperature. A blue-wbite star is very dense(密集的) and hot. When a
star becomes red, its energy has begun to fade(消失). Therefore, a star that is nearing the end of its life is
called a red giant(红巨星). Whilehumans grow smaller in old age, stars grow bigger until they die. In thefar
future, maybe our sun will become a red giant and destroy the Earth! Luckily, it'll be a longtime before we have
to think about that problem.
A. the sun
B. the moon
C. the Pistol Star
D. Rigel
B. kilometers
C. miles
D. light years
B. Rigel.
C. Proxima Centauri.
D. The Pistol Star
B. red
C. yellow
D. red and blue
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