单项选择题

Spiders have excellent eyesight and can see their __________ from a distance twenty times their own length.

A．victim
B．prey
C．pest
D．nest
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单项选择题
The __________ populated big cities are facing worsening environmental problems.
A．densely
B．abundantly
C．highly
D．intensely
单项选择题
More off-shore scenic spots are __________ with the rapid development of transportation means.
A．available
B．convenient
C．achievable
D．accessible
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