单项选择题

A．for
B．by
C．to
D．as
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单项选择题
What is the main reason of the reduction of the grizzly bears’ number
A．Lacking food.
B．Forest deceasing.
C．The coyote existing.
D．Not clear yet.
单项选择题
What is the benefit of using the computer chips
A．Tracking the grizzly bears’ course without interfering them.
B．Being very light.
C．Being handy.
D．Tracking the grizzly bears easily.
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