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Life on earth depends on the sun. Day after day we see its light and feel its【B1】______ , but we do not often know or【B2】______
Life on earth depends on the sun. Day after day we see its light and feel its【B1】______ , but we do not often know or【B2】______
admin
2010-10-28
71
问题
Life on earth depends on the sun. Day after day we see its light and feel its【B1】______ , but we do not often know or【B2】______ the birth or the beginning of their【B3】______ . Yet there are amount of【B4】______ things about the sun. One is its distance from the earth. This is about ninety-three【B5】______ miles. It is to us, a long distance. A【B6】______ of this distance, even if it could be made, would take【B7】______ hundred years even in the【B8】______ rocket.
The sun makes us feel heat, even at a distance of ninety-three million miles. This is not surprising.【B9】______ . 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.【B10】______ This is sufficient for the growth of trees and plants, and for the existence of living creatures on earth.【B11】______ . The heat and light from the sun come in just the right quantities for life on earth.
【B11】
选项
答案
Too much heat and light would destroy the balance of life, so there is no life in the sun, even the proteid
解析
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大学英语六级
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