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  3. What is the research at Johns Hopkins University about? How did the researchers carry out their study?

What is the research at Johns Hopkins University about? How did the researchers carry out their study?

admin2012-09-29  89
问题 What is the research at Johns Hopkins University about?
How did the researchers carry out their study?
选项 A、They studied the findings of several previous research projects.
B、They conduced a questionnaire with 411 pilots.
C、They collected data from the database at the Johns Hopkins University.
D、They analyzed the circumstances of the crashes involved.
答案A
解析 答案可在第三段第一句中找到。
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