单项选择题

How does everything living on earth live（）

A．Each plant can live alone.
B．Each animal can live alone.
C．Everything living on earth cannot live without needing other living things.
D．If living things want to live they must kill each other.

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单项选择题

Why is all life in danger Because （）break up the food chains.

A．Human beings
B．animals
C．plants and animals
D．man and wild animals

单项选择题

Which living things can use sun energy directly（）

A．Animals.
B．Plants.
C．Both animals and plants.
D．All living things.