乙型肝炎病毒的抵抗力很强,哪种方法可使其灭活()
A.居室通风
B.酒精消毒
C.肥皂水洗涤
D.2%来苏儿浸泡
E.煮沸15分钟
参考答案:E
传染病垂直传播的途径是()。
A.接触传播、空气传播
B.胎盘传播、注射传播
C.血液传播,经口传播
D.胎盘传播、上行性传播
E.上行性传播、机械传播
—How is your pet dog?
— He is lovely. But if he _______ at home all day, he _______ at me angrily.
A.keeps; barks
B.is kept; will bark
C.is kept; bark
D.keeps; will bark