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. Benjamin Franklin deserves credit mainly because ________ .

A．he established the United States postal system
B．he served as the postmaster general
C．he increased the number of post offices
D．he was made postmaster by the U. S.

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单项选择题

What’s Mr. Smith’s trouble

A．He locked his keys in his apartment.
B．He doesn’t know when the Andersons come back.
C．He has to wait outside.
D．He didn’t dress well for the party.

单项选择题

When did the first artificial language appear

A．At about 1880.
B．In 1887.
C．In the 20th century.
D．No one knows it.

Questions 18 - 20 are based on the following passage. You now have 15 seconds to read the questions 18 - 20. Benjamin Franklin deserves credit mainly because ________ . 您的浏览器不支持 audio 元素。

Questions 18 - 20 are based on the following passage. You now have 15 seconds to read the questions 18 - 20. Benjamin Franklin deserves credit mainly because ________ .