问题
选择题
Many scientists say that it’s important for us to have ______ food in our diet.
A．a variety of
B．a great deal
C．a large number of
D．a good many
答案
答案：A
B和C后跟不可数名词，D跟可数名词复数， Food为集体名词。选A a variety of food 为各种各样的食物。