Ants are the most mon life form on earth, ___________ tiny, their bined weight is greater than that of the bined weight of all humansA.thoughB.althoughC.even thoughD.as if
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A解析考查连词：A. though虽然，可位于句首，句中，句末B. although虽然，只能在句首，C. even though即使，D. as if好像，句意：蚂蚁是地球上最常见的生命形式，虽然小，但它们团结的力量比人类团结的力量都大。选A。