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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单项选择题

22（）

A．supply
B．find
C．look for
D．give

单项选择题

This passage is mainly about （）.

A．a new way of buying furniture
B．a new way of moving from place to place
C．why some people rent their furniture
D．how some people rent their furniture