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
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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