单项选择题

People probably take part in dangerous sports nowadays because ______.

A．they have a lot of free time
B．they can go to hospital if they are injured
C．their lives lack excitement
D．they no longer need to hunt for food
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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
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.
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