[填空题]Without the sun’s light (warm)______ the earth’s surface, it would be so cold that life could not exist on the earth.

[单项选择]In Earth’’s infancy, its surface was warm enough for life ____ the young Sun was fainter than it is today.
A. in spite of
B. whether
C. neither of which
D. even though

[单项选择]Weather has much to do wire the sun. A. True. B. False.

[单项选择]The earth moves around the sun.
A. before
B. round
C. after
D. over

[简答题]

Life on the earth depends the sun. Day after 56.______day we see its light and feel its warm, but we 57.______do not often consider about its origin. 58.______Yet there are many remarkable things about the 59.______sun. One is their distance from the earth. Even 60.______if it could be made a trip to the sun would spend a long 61.______time even by the fastest rocket. 62.______The sun is a large satellite. The planet 63.______earth is very small in comparison. The sun make 64.______us to feel hot, even at a distance of 93 million miles. 65.______

56.

[填空题]Life on earth depends on the sun. Day after day we see its light and feel its (36) , but we do not often know or (37) the birth or the beginning of their (38) . Yet there are amount of (39) things about the sun. One is its distance from the earth. This is about ninety-three (40) miles. It is to us, a long distance. A (41) of this distance, even if it could be made, would take (42) hundred years even in the (43) rocket.
The sun makes us feel heat, even at a distance of ninety-three million miles. This is not surprising. (44) . But we receive only a small part of this heat. The total heat of the sun could melt a column of ice two and a quarter miles thick and ninety-three million miles high in one second.
The brightness of the sun is equally astonishing. As we said earlier, we receive only a very small part of the sun’s heat. (45) This is sufficient for the growth of t