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.

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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.

单项选择题

The two scientists were quarrelling at the beginning of the story, because __________.

A．the Japanese watch was better
B．the German watch was better
C．each of them thought his own watch was better than the other's
D．both the watches were wrong