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
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单项选择题
What does the second paragraph mainly discuss
A．Some animals and plants depend on each other for existence.
B．Some animals and plants develop their relationship easily.
C．Some plants depend on each other for food.
D．Some animals live batter together.
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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