问题 单项选择题 A2型题

2000年某院入院的新发心肌梗死患者1320名,每年定期对500名患者进行电话随访,2001年死亡21人,2002年死亡18人,2003年死亡39人,2004年死亡43人,2005年死亡31人,则该院心肌梗死患者的5年生存率为()

A.92.2%

B.96.0%

C.27.4%

D.75.8%

E.69.6%

答案

参考答案:E

解析:生存率是指接受某种治疗的病人或患某病的人中,经若干年随访(通常为1、3、5年)后,尚存活的病人数所占的比例。生存率=随访满n年尚存活的病例数/随访满n年的病例数×100%。本题中500名患者随访5年尚存活的病例数为500-21-18-39-43-31=348,生存率=348/500×100%。

阅读理解

第三部分阅读理解

阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。

By analyzing academic data from 10 states, representing the testing of more than 7.2 millions of youths, U.S. researchers found that gender differences in math scores were extremely small among all ethnic groups in grades 2-11.

These findings are in contrast to earlier results from 1990 that indicate measurable differences favoring males in complex problem-solving, beginning in the high school years.

Janet Hyde from University of Wisconsin and colleagues reported their study results in the journal Science on Friday.

Currently, women are largely absent from the highest levels of careers in mathematics, the physical sciences, and engineering. In the United States, Ph.D. programs in engineering currently average only about 15 percent women, and similar statistics have led to stereotypes (成见)about girls and women lacking in mathematical ability.

Now, it is clear that the general population no longer shows a gender difference in mathematical skills, according to this latest report.

And this new data on academic performance in the United States shows that students are tested frequently on "recall" and "skill/concept" items, but rarely on "strategic thinking"(战略思维) or "extended thinking" concepts.

If standardized tests do not assess (评估)the sorts of reasoning that are crucial to careers in science and math, then the skills may not be taught, putting American students at a disadvantage to students in other countries where testing and instruction focuses on more challenging content. "This is a gap that should be fixed," Hyde said.

56. What is the best title of the passage?

A. A new study result about math.                   B. No gender differences in math.

C. Girls are not good at math.                       D. Girls do better in math than boys.

57. The underlined word “crucial” in the last paragraph most probably means______.

A. necessary      B. unimportant         C. important    D . cruel

58. What Hyde said in the last paragraph means that ________.

A. standardized tests should assess the sorts of reasoning so that the skills may be taught

B. testing and instruction focuses on more challenging content in the USA

C. students in other countries are cleverer than American students

D. students should be tested frequently on "recall" and "skill/concept" items

59. The passage is most probably taken from _______.

A. a science magazine B. a research paper        C. a personal diary D. a newspaper

单项选择题