答案:C
—Who is the woman that is watering flowers? Is it your mother?
—No, it _________be her. She went shopping just now. [ ]
A. mustn't
B. may not
C. can't
D. needn't
小鼠仙台病毒的主要传播和扩散方式是:()。
A.直接接触和空气传播
B.直接接触和经水传播
C.经水传播和空气传播
D.经食物传播和经水传播