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    21、Scientists are now trying to find effective ways to slow down global warming and to determine ________part of the world will become wetter or drier．

    A．where               B．whose          C．what           D．which

    21、D

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    Scientists are now trying to find effective ways to slow down global warming and to determine ________part of the world will become wetter or drier．

    A．where               B．whose          C．what           D．which

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