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 does the speaker illustrate with the example of muscle

A．The need to exercise the memory.
B．How the brain differs from other body tissues.
C．The unconscious learning of a physical activity.
D．How nerves control body movement.

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单项选择题

What does the professor say about ancient Greeks who traveled south

A．They noticed an apparent change in the position of the North Star.
B．They observed eclipses at different times of the year.
C．They were the first to estimate the distance between heavenly bodies.
D．They wanted to prove that the Earth was flat.

单项选择题

How many days will this flight last

A．Three days
B．Four days
C．Five days
D．One week

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 does the speaker illustrate with the example of muscle 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 does the speaker illustrate with the example of muscle