This phenomena may be worse than most （）.

The door－to－door campatign also provided a good opportunity to vaccinate children who （）routine imunization.

A.took
B.missed
C.forgot
D.undervent

点击查看答案&解析

Pneumonia has been a（）disease.

A.ordinary
B.commonly
C.simple
D.common

点击查看答案&解析