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
短語辨析。Work out計(jì)算出，鍛煉；carry out執(zhí)行；focus…on…把…聚焦于…;concentrate…on…把…聚焦于…;結(jié)合句意可知C正確。句意：如果我們用意塊鏡子把陽光聚焦于一片干樹葉，它很快就會開始燃燒。
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