单项选择题

In 1845 Sarah Mather invented a submarine telescope that could be used to locate and study underwater objects.

A．illuminate
B．raise
C．find
D．examine
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单项选择题
Frostbitten fingers and toes should be treated with lukewarm water.
A．frigid
B．tepid
C．boiling
D．steamy
单项选择题
Youth hostels provide inexpensive lodging for young people throughout the United States and in other countries.
A．clothes
B．entertainment
C．transportation
D．accommodations
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