The density-dependent theorists have not yet been able to
A. explain the population growth of organisms with short life cycles.
B. re-produce the results of the study of Christian and Davis.
C. show how many mechanisms that manage regulation there are.
D. make sufficiently accurate predictions about the effects of crowding.
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The speaker disapproves of wearing red sweaters if
A. the crowd is wearing them.
B. you can't afford them.
C. you don't look good in red.
D. it is against school regulations,
What can we infer from the passage？
Automobiles will be produced mainly in the developing countries. B, People are bound to live in a world village in the future.
B. Children will grow up with the same characteristics.
C. The automobile makers all over the world will produce the same model.
What is the main idea of this passage？
A. In every school there is a "top" crowd that sets the pace.
B. It is a mistake to follow the "top" crowd blindly.
C. At one time or another you probably did something you knew to be wrong,
D. People who follow the "top" crowd are endangering their very lives.
Today automobiles produced by different countries may have the same basic features because
A. the technology used in producing automobiles is universalizing.
B. consumers consider similar efficiency and economics of cars.
C. there is a fixed standard for making automobiles in the world.
D. people who are growing alike want their cars to be the same.
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