2. 外语
  3. 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

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

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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.
选项
答案warmth
解析 此处应该填入一个名词，前面有了限定成分its。
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