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.
The problem of the standard educational tests is caused by

A．well-informed users.
B．imprecise standard.
C．users who have not enough knowledge of the test.
D．people who attack the test.

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单项选择题

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. The problem of the standard educational tests is caused by 您的浏览器不支持 audio 元素。