单项选择题

Why does the author mention the Massachusetts Bay Colony

A．It was the headquarters of the United States Lighthouse Board.
B．Many of the tallest lighthouses were built there.
C．The first lantern wicks were developed there.
D．The first lighthouse in North America was built there.
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单项选择题
It can be inferred from the passage that lighthouses in the Northeast did NOT need high towers because ______.
A．ships there had high masts
B．coastal waters were safe
C．the coast was straight and unobstructed
D．the lighthouses were built on high places
单项选择题
Wearing a seat belt in a vehicle ______.
A．reduces road accidents to more than half
B．saves lives while driving at a speed up to 30 miles per hour
C．reduces the death rate in traffic accidents
D．saves more. than 15 000 lives each year
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