单项选择题

Questions 17 to 20 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 has happened since the end of the Ice Age

A．Many species have moved further north.
B．Many new species have come into existence.
C．Many species have developed a habit of migration.
D．Many species have become less sensitive to climate.

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单项选择题

According to the expert’s study, the level of happiness in which period of life is the lowest

A．Childhood.
B．Young age.
C．Middle age.
D．Old age.

单项选择题

According to this conversation, what was the stupid mistake

A．The student forgot to hand in his term paper because he was overtired and stressed.
B．The student handed in the earlier draft paper instead of the final edited paper.
C．The student missed the time to apply to grad school.
D．The student found the mistake of the mark on his paper.

Questions 17 to 20 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 has happened since the end of the Ice Age 您的浏览器不支持 audio 元素。

Questions 17 to 20 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 has happened since the end of the Ice Age