单项选择题

The underlined word "they" in the last sentence of the first paragraph refers to （）.

A．birds and parasites
B．birds and sheep
C．parasites and sheep
D．sheep, birds and parasites

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填空题

A.courage B.birdcage C.package D.cottage

单项选择题

A．supply
B．find
C．look for
D．give