单项选择题
A.milk B.grain C.protein D.soybeans
A.people have to spend too much time and energy to produce it B.too much grain protein is needed to produce it C.it contains too much fat and protein D.it is not good to the health
A.in appearance, but not in taste B.neither in appearance nor in taste C.both in appearance and in taste D.in taste, but not in appearance