---__________ than giving money must be done to help the poor farmers.

--- I agree, then, they can make a living by themselves.

A．Nothing more valuable

B．Something more valuable

C．Less valuable nothing

D．Less valuable something

函数调用语句：“fgets(buf,n,fp);”从fp指向的文件中读入，n个字符放到buf字符数组中，函数返回值为______。