单项选择题

The underlined word "it" in the second paragraph refers to the idea that Computer town

A．helps to set up more computer clubs
B．brings people to learn to use computers
C．brings more experts to work together
D．helps to sell computers to the public

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单项选择题

What does the second paragraph mainly discuss

A．Some animals and plants depend on each other for existence.
B．Some animals and plants develop their relationship easily.
C．Some plants depend on each other for food.
D．Some animals live batter together.

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