题目内容

34. ___

A. To learn how to prevent a bone disease.
B. To understand differences between bone tissue and other tissue.
C. To find out how specialized bone cells have evolved.
D. To create artificial bone tissue.

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35. ___

A new fuel for buses.
B. The causes of air pollution.
C. A way to improve fuel efficiency in buses.
D. Careers in environmental engineering.

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31. ___

A. The strength of ocean currents.
B. The movement of sediment deep in the ocean.
C. The best methods for studying deep ocean processes.
D. A new way of measuring the depth of the ocean.

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32. ___

A. Why the book talks about turbidity currents.
B. How winds can affect some ocean currents.
C. The causes of underwater earthquakes.
D. What a turbidity current is.

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33. ___

A. It's cleaner.
B. it's heavier.
C. It's warmer.
D. It moves more slowly.

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34. ___

A. To learn how to prevent a bone disease. B. To understand differences between bone tissue and other tissue. C. To find out how specialized bone cells have evolved. D. To create artificial bone tissue.

35. ___

31. ___

32. ___

33. ___

A. To learn how to prevent a bone disease.
B. To understand differences between bone tissue and other tissue.
C. To find out how specialized bone cells have evolved.
D. To create artificial bone tissue.