单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now listen to the passage.
What is the main subject of the talk

A．How thermographic photography was invented.
B．The advantages of X-rays over thermography.
C．Scientific photography for diagnostic purposes.
D．Several new techniques for reducing pain.

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单项选择题

Why didn’t the woman buy the saucepans earlier

A．Because she didn’t have money with her.
B．Because her neighbor wanted to have them.
C．Because she hadn’t decided to buy then.
D．Because the shop already closed up.

单项选择题

Which kinds of travel books are inspiring and entertaining

A．The first and third.
B．The first and second.
C．The second and third.
D．Selective guide books.

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now listen to the passage. What is the main subject of the talk 您的浏览器不支持 audio 元素。

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now listen to the passage.
What is the main subject of the talk