单项选择题

What is the meaning of the underlined word "waterproof" in the third paragraph

A．Covered with water.
B．Full of water.
C．Cleaned by water.
D．Not allowing water to go through.
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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.
单项选择题
Small animals are said to live faster because they______.
A．have more skin for their weight
B．bum fuel faster than big ones
C．replace lost heat faster
D．keep a high body temperature
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