单项选择题

In the process，the light energy converts to heat energy．

A．reduces
B．changes
C．1eaves
D．drops
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单项选择题
In the western United States one can still find posts to which nineteenth-century cowboys hitched their horses.
A．tied
B．led
C．pulled
D．brought
单项选择题
Practically all animals communicate through sounds,().

A. Clearly
B. Almost
C. Absolutely
D. Basically
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