单项选择题

Questions 4 to 7 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now listen to the conversation. What is the main topic of the conversation

A．The difficulty of raising animals on farms in colonial America.
B．Traffic problems in colonial American cities.
C．Population growth in colonial American cities.
D．Economic conditions in colonial America.
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单项选择题
According to the man, why do modern books decay
A．They are often handled improperly by readers.
B．The paper is destroyed by chemicals.
C．The ink used in printing damages the paper.
D．The glue used in the binding loses its strength.
问答题
[听力原文]Hurricane Names A hurricane is a violent ocean storm near the equator in the eastern Pacific or Atlantic oceans in late summer or early autumn. The same kind of storm is also known by other names. Scientists call them cyclones when they happen just north or south of the equator and in the Indian Ocean. They are called typhoons in the western Pacific Ocean or the China Sea. Weather scientists call hurricanes by names to make clear just which storm they are talking about, especially when two or more take place at the same time. They say using short names is especially important when exchanging storm information among weather stations and ships at sea. An Australian weather scientist began giving women’s names to storms before the end of the nineteenth century. Weather scientists used the names of their girlfriends or wives for storms during World War Ⅱ. The United States weather service started officially using women’s names for storms in nineteen fifty-three. In nineteen seventy-eight, it began including men’s names as well. Today, scientists make up lists of names years in advance. They agree on them at meetings of the World Meteorological Organization. The lists include both American and international names.
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