单项选择题

Questions 15 to 17 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now, listen to the passage.
In 1847 most countries of the world were

A．not yet using postage stamps.
B．collecting valuable stamps.
C．buying stamps from Mauritius.
D．printing their own stamps.

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单项选择题

单项选择题

Questions 15 to 17 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. In 1847 most countries of the world were 您的浏览器不支持 audio 元素。