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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 (氣體), but relatively cool compared to the strong heat at the 3 .

Located about 93 million miles 4 the earth, the sun has a diameter (直徑) 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 (氫), 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 (太陽系)! 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

答案：B;A;B;B;A;C;C;A;D;D;B;C;A;A;D;A;D;B;A;B
解析：

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