6．The majority of doctors __________ smoking is harmful to __________.
A．believe；health
B．believes；health
C．believe；the health
D．believes；healths
解析：选A。考查majority的用法。the majority of...作主语时，其后面的谓语动词的数取决于of后面的名词，所以排除B、D两项。又因“对健康有害”通常为be harmful to health，故排除C项。
5 .request n．& v． 要求，请求
(回归课本P39)to make a request to someone you don’t know very well
向你不甚了解的人做出请求
归纳拓展
ask，request，require，demand
