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Questions 18 - 20 are based on the following passage. You now have 15 seconds to read the questions 18 - 20. The main topic of the passage is ________ .

A．Benjamin Franklin
B．the United States
C．the history of the U. S. mail
D．star routes

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When and where did the strongest earthquake happen in North America

单项选择题

Questions 18 - 20 are based on the following passage. You now have 15 seconds to read the questions 18 - 20. The main topic of the passage is ________ . 您的浏览器不支持 audio 元素。