单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. What’s the experiment designed to demonstrate

A．That babies understand language before they can speak.
B．That babies have simple mathematical skills.
C．Babies’ preferences for different kinds of toys.
D．The influence of television on babies.

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单项选择题

In the Middle Ages students_____

A．took objective tests
B．specialized in one subject
C．were timed by electric clocks
D．never took written exams

单项选择题

What are the man and woman discussing

A．The size of the campus.
B．The city bus system.
C．The school bus system.
D．The differences between two bus systems.

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. What’s the experiment designed to demonstrate 您的浏览器不支持 audio 元素。

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. What’s the experiment designed to demonstrate