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{$mediaurl}What is the talk mainly about
A. The processes by which natural and cultured pearls are created.
B. Some common misconceptions about the formation of pearls.
C. The development of a technology to produce artificial pearls.
D. A biological explanation of why pearls form in oysters.

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{$mediaurl}What is the talk mainly about
A. Actors who became famous as a result of method acting.
B. Different approaches to method acting in modern American theater.
C. The history of Russian theater in the twentieth century.
D. Two important figures in the development of method acting.

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[单项选择]
{$mediaurl}What is the discussion mainly about
A. General features used to define what deserts are.
B. Characteristics shared by all types of deserts.
C. The effects of deserts on the global climate.
D. Different factors that lead to the formation of a desert.

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{$mediaurl}What is the lecture mainly about
A. The various applications of environmental psychology.
B. The role environmental psychology plays in education.
C. The reactions of people to various colors.
D. The importance of testing products in society.

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[单项选择]What is the conversation mainly about

What is the conversation mainly about
A．Online shopping. B．New technology. C．Computers. D．Book stores.
A. Online shopping.
B. New technology.
C. Computers.
D. Book stores.

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[单项选择]What is the talk mainly about
A. Competition in business.
B. Government grants.
C. A type of economic policy.
D. International transportation practices.

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