问题
单项选择题
传染病流行范围的基本单元是（）
A.疫源地
B.易感接触者
C.疫区
D.传染源
E.病原体
答案
参考答案：A
解析：传染源及其排出的病原体向四周播散所能波及的范围称为疫源地，即可能发生新病例或新感染的范围。一般讲范围较小的或单个传染源所构成的疫源地称为疫点，较大范围的疫源地或若干疫源地连成片时称为疫区。故选A。
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传染病流行范围的基本单元是（）
A.疫源地
B.易感接触者
C.疫区
D.传染源
E.病原体
参考答案：A
解析：传染源及其排出的病原体向四周播散所能波及的范围称为疫源地，即可能发生新病例或新感染的范围。一般讲范围较小的或单个传染源所构成的疫源地称为疫点，较大范围的疫源地或若干疫源地连成片时称为疫区。故选A。
I can still remember it as it was yesterday. I was a college freshman and had _______ up most of the night, laughing and talking with friends. Now just before my first _______ of the day, my eyelids were feeling heavier and heavier and my head was drifting down to my desk to make my textbook a _______. A few minutes nap(瞌睡) time before class wouldn’t _______, I thought. BOOM! I lifted my head suddenly and my eyes opened wider than saucers. I looked around with my _______ beating wildly trying to find the cause of the ________. My young professor was looking back at me with a boyish smile on his face. He had ________ dropped the textbooks he was carrying onto his desk. “Good morning!”, he said, still ________. “I am glad to see everyone is _______. Now let’s get started.” For the next hour I wasn’t sleepy at all. It wasn’t from the _______ of my professor’s textbook alarm clock either. It was instead from the _______ discussion he led. With knowledge and good _______ he made the material come _______. His insights were full of both wisdom and loving-kindness. And the enthusiasm and joy that he _______ with were contagious(富有感染力的). I ______ the classroom not only ______ awake, but a little smarter and a little better as well. I learned something far more important than not _______ in class that day too. I learned that if you are going to do something in this life, do it with _______. What a wonderful place this would be if all of us did our work joyously and well. Don’t sleepwalk your way through _______ then. Wake up! Let your love fill your work. Life is too ______ not to live it well.
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