题目内容

47. ___

A. How people in rural areas preserved food.
B. The construction of icehouses.
C. An important industry in the nineteenth century.
D. How improvements in transportation affected industry.

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48. ___

A. Modem technology for the kitchen.
B. Improved transportation systems.
C. Industrial use of streams and rivers.
D. Increased temperatures in many areas.

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49. ___

A. Only wealthy families had them.
B. They were important to the ice industry.
C. They were built mostly on the east coast.
D. They are no longer in common use.

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Audio 3 What point does the lecturer make about whales and sound pollution?___

A. Increased sound pollution means whales 'talk' more at night than during the day.
B. Research shows whales communicate to warn each other of sound pollution.
C. Whales may not survive in some situations where there is sound pollution.
D. Sound pollution from submarines has little impact on whales and other creatures.

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Audio 4 What must the students do before next Wednesday?___

A. email the slides for their presentation to the tutor
B. make enough copies of their handouts
C. post an outline of their talk to the course website
D. practise giving their presentation

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47. ___

A. How people in rural areas preserved food. B. The construction of icehouses. C. An important industry in the nineteenth century. D. How improvements in transportation affected industry.

48. ___

49. ___

Audio 3 What point does the lecturer make about whales and sound pollution?___

Audio 4 What must the students do before next Wednesday?___

A. How people in rural areas preserved food.
B. The construction of icehouses.
C. An important industry in the nineteenth century.
D. How improvements in transportation affected industry.