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 ________ .

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

<上一题目录下一题>

热门试题

单项选择题

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。