题目内容：

两个不可数名词做主语 谓语的单复数形式
the tendency of population boom and shortage of resources __ not properly controlled.用is还是 are?

优质解答

the tendency of population boom 与 （the）shortage of resources 是两件不同的事情,它们作主语时,谓语动词就是are.
又如：（Both）air and water ARE necessary for life.