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
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.
单项选择题
After reading the story what can we infer about the hospital
A．It is a children's hospital.
B．It has strict rules about visiting hours.
C．The nurses and doctors there don't work hard.
D．A lot of patients come to this hospital every day.
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