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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
词义辨析. possible作“或许”解,有“也许如此,也许不如此”之意。强调客观上有可能性,但常常带有“实际可能性很小”的暗示。probable用来指有根据,合情理,值得相信的事物,带有“大概,很可能”的意味。likely强调表面上看来有可能,常暗示从表面迹象来判断.certainly意思是肯定的.根据句意:如果你一天睡觉少于7小时,你更可能感冒.从表面来看,故选D.
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