单项选择题

What is the most economical time to place a commercial

A．06:00-09:00
B．09:00-11:00
C．17:00-22:00
D．22:00-00:00

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单项选择题

In the memo, the word realistic in paragraph 3, line 2, is closest in meaning to

A．flexible
B．practical
C．critical
D．optional

单项选择题

According to the article, which of the following statements is true

A．The highest number of Internet users is the Chinese.
B．The use of languages other than English on the Internet is growing.
C．About 75% of e-mail is infected with viruses.
D．Just over half of the people in the world use the Internet.

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