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课文填空。 根据课文原文,填入所缺内容.★ It was not immediately obvious that wa

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课文填空。
根据课文原文,填入所缺内容.
★ It was not immediately obvious that water was      1      the development of life.
★ This produced    2  , which made it possible for life to develop.
★ I earned my passage by working as an unpaid hand, which    3  .
★ When they crossed the Rocky mountain, they     4   some mountain goats and even
      a grizzly and an eagle.
★ Many of them    5  riding wild horses and can win thousands of dollars.
课文填空。 根据课文原文,填入所缺内容.★ It was not immediately obvious that wa
1. to be fundamental to           
2. a chain reaction  
3. accounted for my appearance    
4. managed to catch sight of
5. have a gift for