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单项选择题

In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.
Questions 1 to 3 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.

How many hours do teenagers spend both in watching TV and surfing on line in a week

A. 70 hours.
B. 17 hours.
C. 15 hours.
D. 34 hours.
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