根据下列文章，回答 51～55 题。
第 51 题 What used to be the danger in being a man according to the first paragraph？
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根据下列阅读材料，回答 51～55 题：
第 51 题 The author says that old family firms __________.
According to the passage，what is one major component of Jupiter？
What does the example of India illustrate？
Where does Dr. Francis suggest Li Ping should stay in Cambridge？
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