问题
单项选择题
描述某一人群中某种疾病的频率，最常用的指标为（）
A.发病率、死亡率、病死率
B.发病率、患病率、生存率
C.发病率、死亡率、感染率
D.发病率、死亡率、患病率
E.死亡率、患病率、续发率
答案
参考答案：D
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描述某一人群中某种疾病的频率，最常用的指标为（）
A.发病率、死亡率、病死率
B.发病率、患病率、生存率
C.发病率、死亡率、感染率
D.发病率、死亡率、患病率
E.死亡率、患病率、续发率
参考答案：D
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| Mr. smith taught eighth-grade science. On the first day of class, he gave us a(an) 1 about a creature called the cattywampus, an animal that 2 during the Ice Age. He passed around a skull (头骨) as he talked. We all took notes and 3 had a test. When he returned my paper, I was 4 . There was a big red "×" through 5 of my answers. I had failed. There 6 have been some mistake! I had written down what Mr. Smith said. Then I 7 that everyone in the class had failed. What had happened? "Very simple." Mr. Smith said. He had 8 all those things about cattywampus. There had 9 been any such animal. The information in our 10 was wrong. Did we expect praise for a wrong answer? We were very 11 . What kind of test was that? And what kind of teacher? "You should have figured it out", Mr. Smith said. At the very moment he was passing around that cattywampus skull, hadn't he been telling us that no trace of the animal 12 ? He had described its color and other facts he couldn't have known. He had given the animal a strange name, and we still hadn't 13 . He said that the 14 on our papers would be recorded in the grade book. And they were. Mr. Smith said he hoped we would learn something from this 15 . Teachers and notebooks are not very 16 . In fact, no one is. He told us not to let our minds go to sleep and to 17 up if we ever thought he or the textbook was wrong. I haven't made any great scientific discoveries, 18 Mr. Smith's class gave me and my classmates something just as important: the 19 to look people in the eye and tell them 20 wrong. | ||||
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