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
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单项选择题
How do all food chains break
A．One kind of animals is eaten up.
B．One kind of plants is destroyed.
C．One kind of animals eats another.
D．One of the links is destroyed.
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.
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