Bread is a basic food .这里的food为什么可以加a呢

Bread is a basic food .这里的food为什么可以加a呢 health is a basic human need There is only a piece of bread freedom of e____ is a basic of human right There is not enough _____ for birds because people build too many houses here A.space B.areas C.foo here_____some bread .Have some bread.A.is B.are C.do The bread and butter ( ) healthy food A is B are The bread is made ____ wheat.A.of B.from Bread is made of ( )A,flour B,flower C,wheat that nearly all behavior is learned behavior is a basic assumption of social scientists. the where bread is the where bread is basic Basic basic basic basic what is the meaning of indicative of a basic change in human nature?