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.
Where was the first telephone service in, America established
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A.New York.
B.Washington D.C.
C.Philadelphia.
D.Chicago.
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单项选择题
How many pairs of twins did Dr. Jarvik’s studies involved
A.136.
B.60.
C.70.
D.80.
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单项选择题
What is the main topic of the passage
A.The mechanics of rain.
B.The climate of North America.
C.How gravity affects air current.
D.Types of clouds.
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