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The sun gives off energy ________heat and light．
- A.in face of
- B.in terms of
- C.in the form of
- D.in case of
The sun is a star. It is a flaming ball of extremely 1 gases. The surface temperature is about 11,000 F., hot enough to turn every 2 to vapor (气体), but relatively cool compared to the strong heat at the 3 .
Located about 93 million miles 4 the earth, the sun has a diameter (直径) that is nearly equal to 109 of our ear ths 5 up like a row of beach balls, and a mass that is about 330 000 times the mass of the earth.
The sun is the original source of nearly all our 6 . It is mostly made of hydrogen (氢), 7 it also contains nearly every other kind of atom (原子 )that exists on the earth. The sun obtains its energy from a process of fusion (溶解) in which hydrogen atoms are changed into helium (氦) atoms 8 extreme heat and pressure. This process creates a great noise, but we cannot hear it because 9 does not travel through empty space.
Our sun is not even 10 large or bright compared to 11 stars. Stars vary in size from smaller than the earth to large enough to hold a good part of our solar system (太阳系)! The 12 of a star shows its temperature. A star may be red, yellow, white, or blue.
The nearest star is 4.3 light years from the earth. A light year is the 13 light travels in one year, or about 6 million miles. The 14 stars are billions of light years away. Some are 15 far away that if they were to blow up today, their light would continue to be seen from the earth 16 a million years! Our sun is part of a great galaxy (星系) of 30 billion stars called the Milky Way. 17 , there are billions of galaxies within 18 of our telescopes and countless billions beyond. The bigness of space quite __19 human comprehension. How exciting it is to live in an age 20 human beings have begun to explore that space.
1．
A. cold B. hot
C. cool D. warm
2．
A. solid B. water
C. steam D. air
3．
A. surface B. center
C. middle D. bottom
4．
A. away B. from
C. far D. within
5．
A. lined B. stood
C. put D. tied
6．
A. food B. things
C. energy D. lives
7．
A. however B. while
C. although D. even if
8．
A. under B. by
C. of D. with
9．
A. explosion B. noise
C. voice D. sound
10．
A. very B. relatively
C. specially D. especially
11．
A. another B. other
C. others D. the others
12．
A. surface B. bigness
C. color D. light
13．
A. distance B. space
C. time D. place
14．
A. farthest B. smallest
C. biggest D. nearest
15．
A. too B. such
C. quite D. so
16．
A. for B. with
C. in D. by
17．
A. But B. Beside
C. Nevertheless D. In addition
18．
A. distance B. range
C. time D. space
19．
A. beyond B. outside
C. out of D. far from
20．
A. where B. when
C. which D. because
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Located about 93 million miles 4 the earth, the sun has a diameter (直径) that is nearly equal to 109 of our ear ths 5 up like a row of beach balls, and a mass that is about 330 000 times the mass of the earth.
The sun is the original source of nearly all our 6 . It is mostly made of hydrogen (氢), 7 it also contains nearly every other kind of atom (原子 )that exists on the earth. The sun obtains its energy from a process of fusion (溶解) in which hydrogen atoms are changed into helium (氦) atoms 8 extreme heat and pressure. This process creates a great noise, but we cannot hear it because 9 does not travel through empty space.
Our sun is not even 10 large or bright compared to 11 stars. Stars vary in size from smaller than the earth to large enough to hold a good part of our solar system (太阳系)! The 12 of a star shows its temperature. A star may be red, yellow, white, or blue.
The nearest star is 4.3 light years from the earth. A light year is the 13 light travels in one year, or about 6 million miles. The 14 stars are billions of light years away. Some are 15 far away that if they were to blow up today, their light would continue to be seen from the earth 16 a million years! Our sun is part of a great galaxy (星系) of 30 billion stars called the Milky Way. 17 , there are billions of galaxies within 18 of our telescopes and countless billions beyond. The bigness of space quite __19 human comprehension. How exciting it is to live in an age 20 human beings have begun to explore that space.
1．
A. cold B. hot
C. cool D. warm
2．
A. solid B. water
C. steam D. air
3．
A. surface B. center
C. middle D. bottom
4．
A. away B. from
C. far D. within
5．
A. lined B. stood
C. put D. tied
6．
A. food B. things
C. energy D. lives
7．
A. however B. while
C. although D. even if
8．
A. under B. by
C. of D. with
9．
A. explosion B. noise
C. voice D. sound
10．
A. very B. relatively
C. specially D. especially
11．
A. another B. other
C. others D. the others
12．
A. surface B. bigness
C. color D. light
13．
A. distance B. space
C. time D. place
14．
A. farthest B. smallest
C. biggest D. nearest
15．
A. too B. such
C. quite D. so
16．
A. for B. with
C. in D. by
< / span>17．
A. But B. Beside
C. Nevertheless D. In addition
18．
A. distance B. range
C. time D. space
19．
A. beyond B. outside
C. out of D. far from
20．
A. where B. when
C. which D. because
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The sun gives off energy ________heat and light．
in face of
in terms of
in the form of
in case of
If the sun has enough power to warm and light the whole earth, it must have enough power to do other things, too. Can we use the sun's abundant energy to supply electricity, or at least to perform the functions which electricity or other types of power usually perform? The answer is yes.
For example, people have for many years been using the reflected heat of the sun to cook.
Solar cookers have been built with several curved(弯曲) mirrors reflecting the sun and focusing its heat on the cooking component. This equipment can be used just like a gas or electric stove; it is more expensive to make but it does not need any fuel, and so costs nothing to use. Another possibility of using solar energy is in househeating.
The form of energy we use most is electricity, and every day more is needed. But electricity has to be made, too, and to make it are required--oil, gas and nowadays even uranium(铀).
The question which worries everyone today is：how long will these fuels last? Nobody knows it for sure, but most experts think it will soon be difficult to obtain sufficient electricity from these sources. It is possible that the sun can make a contribution here, too.
Solar power has already been used to produce terrific heat. In Southern France a solar furnace(huge stove) has been built, where temperatures reach more than 3,000℃. This furnace is only used for experiments at present, but could be used to produce steam for a power station.
1. What is the main idea of the passage? (Please answer within 10 words. )
2. Which sentence in the passage can be replaced by the following one?
The sun can also make it possible for us to get a large quantity of electricity instead of from other fuels.
3. Please fill in the blank in the third paragraph with proper words or phrases to complete the sentence. (Please answer within 10 words.)
4. Which can last longer, the ordinary fuels or the solar energy? What shall we do to have enough electricity? (Please answer within 30 words.) 5. Translate the underlined sentence in the second paragraph into Chinese.
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