单选题 2.  Jack often says his greatest happiness ______ serving the handicapped children.
【正确答案】 B
【答案解析】 考查动词搭配辨析
   rely on意为“依靠,依赖”;consist in意为“在于,存在于”;be composed of意为“构成”;comprise意为“组成”。该句指他最大的快乐在于为残疾儿童服务,故选B。