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.

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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

If you want to use your Business Telecard International, you have to

A．use a card phone
B．phone on Sunday
C．make a direct dialing call
D．pay extra