单项选择题

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20.
When should a letter be considered obligatory

A．When you make friends.
B．When you receive a gift.
C．When you want to visit your friends.
D．When you haven’ t answered a letter for a long time.

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Percentage of computer information in English is ______ .

Questions 17-20 are based on the following passage. You now have 20 seconds to read questions 17-20. When should a letter be considered obligatory 您的浏览器不支持 audio 元素。