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.
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
How many adults were killed in the explosion
A．22.
B．9.
C．76.
D．13.
单项选择题
Where was the first telephone service in, America established
A．New York.
B．Washington D.C.
C．Philadelphia.
D．Chicago.
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