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
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 better together.
单项选择题
Why did mother go to see Dagmar in the hospital
A．To give her some message about dad.
B．To make sure her room was clean.
C．To check that she was still there.
D．To find out how she was.
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