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单项选择题

流行性脑脊髓膜炎的流行病学特点

A.带菌者是主要传染源
B.病菌由飞沫直接经空气传播
C.冬春季流行
D.6个月～2岁的婴幼儿发病率最高
E.以上均是
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相关考题

未知题型
——Who is the man standing by the window? ——He is ______ .
A.teacher
B.a tall man
C.our teacher
未知题型
第三节 短文理解2
阅读下列短文，从[A]、[B]、[C]三个选项中选择一个正确答案。
Most children like to watch TV. It's very interesting. By watching TV they can see and learn a lot and know many things about their country and the worlD.Of course, they can also learn over the radio. But they can learn better and more easily with TV. Why? Because they can hear and watch at the same timE.But they can't see anything over the radio.
TV helps to open children's eyes. TV helps to open their minds, too. They learn more and better ways of doing things. They may find the world is now smaller than beforE.
Many children watch TV only on Saturday or Sunday evenings. They are always busy with their lessons. But a few children watch TV every night. They go to bed very latE.They can't have a good rest. How about you, my young friend?
A few children go to bed late because they ______ .
A.are busy with their lessons
B.do their homework
C.watch TV
单项选择题
下列哪项不是流行性出血热早期外周血象改变
A.白细胞计数增高
B.类白血病样反应
C.嗜酸性粒细胞减少以至消失
D.异常淋巴细胞增多
E.血小板减少
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