单项选择题

What are the two speakers talking about（）

A. Electricity bills.
B. The cost of living.
C. The heating system.
D. Types of energy.

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单项选择题
How many people have had a cellphone in the United States（）

A. More than 107 million.
B. More than 85 million.
C. More than 117 million.
D. More than 45 million.
单项选择题
What aspect of stress is the talk mainly about（）

A. The pitfalls of stress.
B. How to manage stress.
C. The realities of stress.
D. Why stress is bad.
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