问题
单项选择题
连续传播造成的流行或爆发的特点是（）。
A.病例分批出现，可以划分成代
B.发病曲线突然升高，很快下降
C.有一个流行高峰
D.全部病例在一个最长潜伏期内
E.流行曲线一般不留拖尾现象
答案
参考答案：A
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连续传播造成的流行或爆发的特点是（）。
A.病例分批出现，可以划分成代
B.发病曲线突然升高，很快下降
C.有一个流行高峰
D.全部病例在一个最长潜伏期内
E.流行曲线一般不留拖尾现象
参考答案：A
In the future, scientists would put very small computers in our heads. This can help people a lot. ____ these small computers, the people with ear diseases will be able to hear. And the people with eye diseases can ____. These small computers will not be just for ____ people. Most of us will have these computers to make our life ____. For example, if we have it, we can think ____ and we can remember more things. For students, computers can do ____ things. Maybe in the near future students ____ schoolbags. They just need to carry a small computer to ____, because the textbooks, exercise books, and notebooks are all in the computer. The teachers will check students’ homework with computers, ____. But this can give another problem, because ____ will be easier for students to copy each other’s homework. Everything will be possible. We never know what will happen.
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