单项选择题
In this section, you will hear several passages. Listen to the passages carefully and then answer the questions that follow.
Questions 11 to 13 are based on. the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.
In this passage, what does the term "coalescence" refer to

A.The gathering of small clouds to form large clouds.
B.The growth of droplets.
C.The fall of raindrops and other precipitation.
D.The movement of dust particles in the sunlight.


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3.单项选择题
Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.
A long-term study of 136 pairs of twins showed that ______ .

A.they lost a little ability to reason over the years
B.the only factor which declined over the years was their speed with which to perform mental tasks
C.their memory was not as good as it had once been
D.their minds became a bit more active as they grew older

7.单项选择题
Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage.
Mental decay due to aging is ______ .

A.common
B.much more common than most people believe
C.much less common than most people believe
D.true of those over sixty

10.单项选择题
Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage.
What causes the prices of the telephone system to lower in America

A.The material became cheaper.
B.There was more competition.
C.More people used the phones.
D.The phones were connected across the sea.