题目内容
（请给出正确答案）
A heavy snow______a good harvest year.
A．means
B．shows
C．promises
D．permits
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A．Iraq's deadly civil war
B．Liberia's deadly civil war
C．the internationai pressure
A．It is a children's hospital.
B．It has strict rules about visiting hours.
C．The nurses and doctors there don't work hard.
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Reading is an experience quite different from watching TV；there are pictures ______ in your mind instead of before your eyes.
A．to form
B．form
C．forming
D．having formed
A．practise to sing
B．practise singing
C．to practise to sing
D．to practise singing
A．If you need help, please turn to your teachers.
B．The traffic moves on the left side of the road in this country.
C．It is against the law for anyone to buy cigarettes or tobacco.
Every animal is a living radiator(散热器) -- heat formed in its cells and given-off through its skin. Warm-blooded animals keep a normal temperature by continuously replacing lost surface heat; smaller animals, which have more skin for every ounce (盎司) of body weight, must produce heat faster than bigger ones. Because small animals burn fuels faster, scientists say they live faster. The speed at which an animal lives is determined by measuring the rate at which it uses oxygen (氧气). A chicken, for example, uses one-half cubic (立方的) centimeters of oxygen every hour for each gram it weighs. Because it uses oxygen eight times as fast, it is said that the mouse is living eight times as fast as the chicken. The smallest of the warm-blooded animal, the humming-bird, lives a hundred times as fast as an elephant. There is a limit to how small a warm-blooded animal can be. A bird that weighs only two and a half grams would starve to death. It would burn up its food too rapidly and would not be able to eat fast enough to supply itself more fuel.
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
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