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
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(答案→)A. a variety of
B. a great deal
C. a large number of
D. a good many
解析：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。