单项选择题

Questions 11 to 14 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 the speaker mainly talking about

A．Three groups of learners.
B．The importance of business English.
C．English for Specific Purposes.
D．Features of English for different purposes.
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单项选择题
Why is the question of how easily people can get used to working at night no mere academic one
A．Because few people like to reverse the cycle of sleep and wakefulness.
B．Because sleep normally coincides with the hours of darkness.
C．Because people are required to work at night in some fields of industry.
D．Because shift work in industry requires people to change their sleeping habits.
单项选择题
The passage mainly discusses
A．the reason for the sea cucumber’s name.
B．what makes the sea cucumber unusual.
C．how to identify the sea cucumber.
D．places where the sea cucumber can be.
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