题目内容：
根据资料回答第题。
Milk is often called the perfect food because it __________．
A. contains bacteria
B. kills harmful bacteria
C. aids in digestion
D. has many helpful food elements
参考答案：
答案解析：
单选题：根据资料回答第题。Milk is often called the perfect food because it __
- 题目分类：英语(一)
- 题目类型：单选题
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Milk is often called the perfect food because it __________．
A. contains bacteria
B. kills harmful bacteria
C. aids in digestion
D. has many helpful food elements