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If you sleep less than 7 hours a day, you are more      to catch a cold.
A．possibleB．certainlyC．probableD．likely
D
詞義辨析. possible作“或許”解，有“也許如此，也許不如此”之意。強調(diào)客觀上有可能性，但常常帶有“實際可能性很小”的暗示。probable用來指有根據(jù)，合情理，值得相信的事物，帶有“大概，很可能”的意味。likely強調(diào)表面上看來有可能，常暗示從表面跡象來判斷.certainly意思是肯定的.根據(jù)句意:如果你一天睡覺少于7小時,你更可能感冒.從表面來看,故選D.
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