Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation.

The woman is good at

What is the probable relationship between the man and t...

单项选择题What is the probable relationship between the man and the woman

What is the main topic of the passageA．The mechanics of...

单项选择题What is the main topic of the passage

Where was the first telephone service in, America estab...

单项选择题Where was the first telephone service in, America established