单项选择题
What does the man say about some elderly people（）
A．They would rather travel around than stay at home. B．They prefer to carry cash when traveling abroad. C．They usually carry many things around with them. D．They don’t like to spend much money on traveling.
单项选择题 From the research conducted by the communications provider Inter-Tel, we learn that（） .
单项选择题 What is Neil Stephenson’s advice to firms contracting internet services（）
单项选择题 What is the main topic of this passage（）
