下列病毒性肝炎母婴垂直传播可能最小的是
A．乙型肝炎 B．丙型肝炎C．丁型肝炎 D．戊型肝炎E．庚型肝炎
参考答案：D
_____ you come across new words, don’t refer to your dictionary at once but guess their meanings according to the context.
A．The first time
B．Next time
C．For the first time
D．Since
能达到实验目的的是
A．称NaOH固体的质量
B．读数为10.60
C．反应热的测定
D．收集氯气
