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 main subject of this passage

A．Higher education in the US.
B．Community colleges in the US.
C．The number of high school graduates.
D．The difference between private and state universities.

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单项选择题

In which of the following places have snakes never been found

A．In green forests.
B．In the North Pole region.
C．In the Pacific Ocean.
D．In disc deserts.

单项选择题

In the dream laboratory, when are the dreams recorded

A．As soon as the student wakes in the morning.
B．At stated intervals during the night.
C．About five minutes after each dream.
D．Immediately after each dream.

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 main subject of this passage 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 main subject of this passage