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
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.
单项选择题
What is the most expensive type of call
A．Direct dial.
B．Through the operator.
C．Reverse charge call.
D．Calling outside office hours.
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