单选题
Certain drugs can prevent transmission of the ______ from a pregnant mother to her child.
A. vegetation B. virus
C. poison D. cell
A
B
C
D
【正确答案】
B
【答案解析】
[解析] vegetation植被；virus病毒；poison毒药；cell单元，细胞，(尤指监狱或寺院的)单人房间，电池
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