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 traveling with the sheep
C．they depend on the sheep for existence
D．they find the position most comfortable
单项选择题
When is it cheaper to make an international call
A．10 a.m.
B．5 p.m.
C．11 p.m.
D．8 a.m.
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