问题
选择题
The professor got a disease in blood for the _______ of fresh vegetables and fruit.
A．snake
B．lack
C．ignorance
D．minority
答案
答案：B
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The professor got a disease in blood for the _______ of fresh vegetables and fruit.
A．snake
B．lack
C．ignorance
D．minority
答案：B
缺失，余留牙均健康