How many do you want?A. riceB. tomatosC. pieces of breadD. potato

问题补充：

How many do you want?

A. rice

B. tomatos

C. pieces of bread

D. potato

答案：

A. rice

B. tomatos

(答案→)C. pieces of bread

D. potato

解析：how many 对可数名词提问后跟可数名词复数形式，所以A和D不对，B答案的

复数应该是加es，所以也不正确，故选C。