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【单选题】
erage variable cost is:A.
variable cost per unit multiplied by quantity.
B.
total variable cost divided by quantity.
C.
the difference between average total cost and total cost.
D.
the difference between total cost and total fixed cost.
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举一反三
【单选题】What is important for human bodies to renew?
A.
Evolution.
B.
Biological condition.
C.
Reproduction.
D.
Old age.
【单选题】Why virtual reality and other technology are used in studying human evolution?
A.
Researchers discussed them and decided to develop these technologies in research.
B.
Internet is widely used and the need for communicating via computers is becoming urgent.
C.
Limited access to original stones and hidden information in inaccessible interior made it necessary.
D.
It will be cheaper and more convenient.
【单选题】Human evolution is a multidisciplinary problem, one of its aspects is the origin and development of_______ human psychological features.
A.
distinct
B.
distinctly
C.
distinctive
D.
distinctively
【简答题】Human being is a product of the consecutively evolutional process which involves countless times of genetic transformation.The irresistible process has never been interrupted since the earth came into...
【单选题】所谓“运动状态的改变”的正确理解是
A.
仅指速度大小的改变
B.
可能为只速度方向的改变
C.
要改变物体的运动状态，必须有力的作用
D.
物体运动状态的改变与物体的初始运动状态有关
【单选题】Which of the following is most probably the best title for the passage?
A.
Human Evolution Going Nowhere.
B.
Sex Ratio Changes in Human Evolution.
C.
Ways of Continuing Man's Evolution.
D.
The Evolutionary Future of Nature.
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