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    When it ______ research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.
    A．refers toB．related toC．comes to D．talks to
    C
    考查句型：when it comes to 当谈到什么的时候，当谈到研究心脏病以及心脏病对人体影响的时候，我们没有足够的替代品在动物身上使用。故选C。
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