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

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热门试题

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 better together.

单项选择题How about the German watch at last

A．It went more correctly than before.
B．It stopped working.
C．It went as well as the Japanese one.
D．It was better than the Japanese one.