单项选择题

The way to stop water pollution is______.

A．to put oxygen into the river
B．to realize the serious situation clearly
C．to make the waste materials harmless
D．to make special room in the sea for our waste

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热门试题

单项选择题

The living things die because there is no ______ in the river or sea.

A．oxygen
B．poison
C．water
D．fish

单项选择题

According to the passage, which of the following inferences is possibly true

A．Small animals have less skin for their body weight than large ones.
B．The humming-bird lives faster than any other warm blooded animals.
C．There is no limit to how large a warm blooded animal can be.
D．The humming-bird is the smallest of the warm blooded animals.