单项选择题

Why has traveling in Europe become easier compared to five years ago

A．Because you needn't drive a car on your own.
B．Because you can use a calculator to exchange money.
C．Because applying for different visas is much simpler.
D．Because one visa is good enough for a number of countries.
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单项选择题
The passage says that every animal is a living radiator because it ______.
A．produces heat in its body cells
B．burns fuel to produce heat
C．sends out heat through its skin
D．takes in oxygen for burning fuel
单项选择题
What can we infer from the text
A．There is no limit as to how large a warm-blooded animal can be.
B．The humming-bird lives faster than any other warm-blooded animals.
C．Small animals have less skin for their body weight than large ones.
D．The humming-bird is the smallest of the warm-blooded animals.
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