单项选择题

The females in the rat population were （） by the high population density.

A．most seriously affected
B．the most seriously affected
C．the most serious affected
D．the serious most affectect

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单项选择题
Pigeons have been used as messengers, for they have special ability （）.

A.to send letters
B.to find home
C.to carry food for men
D.to lead the way for people
单项选择题
The secret of the homing pigeons is （）.

A.how they find food
B.how they find home
C.how they take a letter
D.how they take care of children
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