What is the lecture mainly about？ Click on two answers.

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  A．Animals yawn for a number of reasons. B．Yawning results only from fatigue of boredom. C．Human yawns are the same as those of other animals. D．Only social animals yawn.

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• What is mainly discussed in the passage？

  A．The development of e-mail in the world. B．The advantages of e-mail. C．The popularity of writing in people's life. D．A comparison between e-mail and long-distance calls.

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• What is the subject of Tim's first lecture？

  A．Industrial Revolution B．French Revolution. C．Chinese Revolution.

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  A．organically grown foods are nutritious. B．how to buy organically grown foods. C．what does organically grown foods mean？ D．a general standard should be established to regulate the organically grown produce.

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• What is the main purpose of the lecture？

  A．To point out similarities in Emerson"s essays and poems B．To prepare the students to read an essay by Emerson C．To compare Emerson"s concept of universal truth to that of other authors D．To show the influence of early United States society on Emerson"s writing 此题为多项选择题。

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• According to the lecture, what is one possible reason that displacement activities are often grooming behaviors？

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• What is the main message conveyed by the text？

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  A.Volcanic eruptions are not always deadly. B.Older volcanic eruptions were more destructive. C.Carbon dioxide emissions often give rise to global warming. D.It is not easy to calculate the killing power of a volcanic eruption.

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  A．The developmental deformities of the butterfly species. B．The migratory patterns of certain species of butterflies. C．The developmental stages of the butterfly species. D．The distinguishing anatomical features of caterpillars and butterflies.

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• What is the best type of online lecture？

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