单项选择题

Questions 15-18 are based on the following conversation. You now have 20 seconds to read the questions 15-18. What is the main topic of the conversation

A．How to select a good umbrella.
B．How to treat minor aches and pains.
C．How to sharpen the senses.
D．How to predict the weather.

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单项选择题

单项选择题

Questions 15-18 are based on the following conversation. You now have 20 seconds to read the questions 15-18. What is the main topic of the conversation 您的浏览器不支持 audio 元素。