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
Some birds like to sit on a sheep because ______.
A．they can eat its parasites
B．they enjoy travelling with the sheep
C．they depend on the sheep for existence
D．they find the position most comfortable
单项选择题
When the nurse talked to mum she thought mum was a______.
A．nurse
B．visitor
C．patient
D．cleaner
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