根據(jù)課文填空
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.


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

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