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.
Dr. Jarvik’s studies showed that

A．they lost a little ability to reason over the years.
B．there is no decline in knowledge or reasoning ability.
C．their memory was not as good as it had once been.
D．their minds became a bit more active as they grew older.
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单项选择题
What was the cause of the explosion according to people there
A．Children playing with fire.
B．Fireworks set off in a house with explosives.
C．Sparks from a fireworks display falling on the warehouse.
D．The firing of a gun.
单项选择题
Before the Bell Company became a publicly held corporation, how were the calls passed to their destination
A．Through manual switchboards.
B．Through reading manuals.
C．Through electronic switchboards.
D．Through voice switches.
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