单项选择题

For a commuter trip of 500 miles, about how much less fuel would maglev train use compared to a small plane

A．25%.
B．75%.
C．50%.
D．80%.
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According to the passage, when could people start using a maglev commercially
A．In 5 years.
B．In 20 years.
C．In 10 years.
D．In more than 20 years.
单项选择题
Mountainous areas have a poorer TV ______ than cities.
A．receipt
B．reaction
C．reception
D．response
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