单项选择题

Question 6 is based on the following news. At the end of the news item, you will be given 10 seconds to answer the question.
Now listen to the news.

A．$600m.
B．$10bn.
C．$2.5bn.
D．$2,500.
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单项选择题
Walt Whitman helped to promote the development of
A. sonnet.
B. couplet.
C. blank verse.
D. free vers
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