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    精英家教网 > 高中英语 > 题目详情
    If we_________ sunlight_________ a dry leaf with a piece of glass, it may start burning.
    A．work; outB．carry; outC．focus; onD．concentrate; on
    C
    短语辨析。Work out计算出，锻炼；carry out执行；focus…on…把…聚焦于…;concentrate…on…把…聚焦于…;结合句意可知C正确。句意：如果我们用意块镜子把阳光聚焦于一片干树叶，它很快就会开始燃烧。
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