题目

阅读理解Research has shown thattwo-thirds of human conversation is taken up not with discussion of thecultural or political problems of the day, not heated debates about films we'vejust watched or books we've just finished reading, but plain and simple gossip(说闲话). Language is our greatesttreasure as a species, and what do we frequently do with it? We gossip. Aboutothers' behavior and private lives, such as who's doing what with whom, who'sin and who's out and why; how to deal with difficult social situationsinvolving children, lovers, and colleagues. The reasons for people'spreferen血小板是一类形体较小、形状不规则、没有细胞核的血细胞，它们的主要功能是（　　）A．止血和加速凝血B．运输氧气和二氧化碳C．防御和保护D．运输养料和废物