题目内容

根据课文填空
Water had also appeared on other planets like Mars but,   1 the earth,it had  2  later. It was not immediately obvious  3 water was to be   4 to the development of life.    5 many scientists believe is that the continued   6   of water allowed the earth to dissolve  7 gases and acids into the oceans and seas. This produced a    8 reaction,  9  made  10  possible for life to develop.


【小题1】unlike
【小题2】disappeared
【小题3】that
【小题4】fundamental
【小题5】what
【小题6】presence
【小题7】harmful
【小题8】chain
【小题9】which
【小题10】it

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