单项选择题

A．later
B．earlier
C．sooner
D．ago
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单项选择题
A．didB．couldC．mightD．must
A．did
B．could
C．might
D．must
单项选择题
How do naturalists regard the rattle of the rattlesnake
A．They believe that the snake is able to control the rattle.
B．They believe that the snake is unaware of its rattle.
C．They believe that the rattle is a nervous action.
D．They believe that the rattle is a deliberate warning.
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