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单项选择题

Given the information in the following table, Home's opportunity cost of widgets is ___________.

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2. Listen to the passage about daily salt intake and complete the ressearch report.
  Discourse type: [填空1]
  Research Report
I. people who carry out the study: [填空2]at Havard Medical School
II. Subject of study: people with [填空3]high blood pressure
III. Way of study: cutting salt [填空4] from 10-[填空5] grams a day
IV. Results of study:
        A．risk of[填空6] disease over the next decade being cut by a quarter
        B. chances of dying from cardiovascular disease falling by[填空7]
                  V. Experts’ suggestions.
单项选择题
产妇，28岁，产后2个月，母乳喂养，产妇咨询其避孕方式，最适宜的避孕方法是
A、长效口服避孕药
B、短效口服避孕药
C、阴茎套
D、安全期避孕
E、探亲避孕药
单项选择题
弹性力学的基本假定为：连续性，完全弹性，均匀性，各向同性，小变形。（ ）
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