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. Which of the following best describes the man at the beginning of the conversation

I don't think that John will be able to win the gold me...

单项选择题I don't think that John will be able to win the gold medal at the Olympic Games, _______

How many_______known altogetherA．species of fishes areB...

单项选择题How many_______known altogether

Why did southerners want to keep slaveryA．They could em...

单项选择题Why did southerners want to keep slavery