[单项选择]The passage says that every animal is a radiator because it______.
A. takes in oxygen for burning fuel
B. burns fuel to produce heat
C. sends out heat through its skin
D. produces heat in its body cells

[单项选择]The passage says that every animal is a radiator because it______.


A. takes in oxygen for burning fuel
B. burns fuel to produce heat
C. sends out heat through its skin
D. produces heat in its body cells

[单项选择]

Passage 4
Every animal is a living radiator--heat formed in its cells is given off through its skin. Warm blooded animals maintain a steady temperature by constantly replacing lost surface heat; smaller animals, which have more skin for every ounce of body weight, must produce heat faster than bigger ones. Because smaller animals burn fuel faster, scientists say they live faster.
The speed at which an animal lives is determined by measuring the rate at which it uses oxy gen. A chicken, for example, uses one-half cubit centimeter of oxygen every hour for each gram it weights. The tiny shrew uses four cubit centimeters of oxygen every hour for each gram it weights. Because it uses oxygen eight times as fast, it is said that the mouse-like shrew is living eight times as fast as the chicken. The smallest of the warm-blooded creatures, tile humming-bird, lives a hundred times as fast as an elephant.
There is a limit to how small a warm-blooded animal can
A. have more skin for every ounce of body weight
B. replace lost heat faster
C. bum fuel faster
D. maintain a higher body temperature

[单项选择]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]The muscles of a fossilized animal can sometimes be reconstructed because______.

[单项选择]Every plant, animal, and human being needs water to （） alive.
A. stay
B. make
C. run
D. glow

[单项选择]Their______Coil Smith says, “Animal research is irrelevant to our health and it can often produce misleading results. ”
A. spokesman
B. spokeman
C. speaking man
D. spoken man

[单项选择]As the graduation is drawing near, every student began to ________ his future.
A. compensate
B. contemplate
C. jeopardize
D. manifest

[单项选择]The speed at which an animal lives is determined by ______ the rate at which it uses oxygen.
A. measuring
B. assessing
C. surveying
D. pleasing