单项选择题

We learn from the text that corals depend on plants for ______.

A．comfort
B．light
C．food
D．oxygen
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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
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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