评价预防接种群体效果的免疫学指标是（）。
A.抗体阳转率
B.保护率
C.效果指数
D.发病率
E.病死率
参考答案：A
— I won’t choose either of the two shirts. They are too large for me.
— Well, I a small one for you.
A. was fetching B. fetched C. will fetch
我国重要的疟原虫媒介有（）。
A.微小按蚊
B.中华按蚊和微小按蚊
C.嗜人按蚊和大劣按蚊
D.斯氏按蚊和中华按蚊
E.A+B+C
