题目内容
n. the relationship between two groups of people or things that is represented by two numbers showing how much larger one group is than the other
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n. a sharp pointed object that riders sometimes wear on the heels of their boots and use to encourage their horse to go faster; vt. to encourage sb.to do sth. .or to encourage them to try harder to achieve sth.
vi. to shake slightly because you are cold, frightened, excited, etc.
a. not studying or looking at sth. thoroughly; seeing only what is obvious; appearing to be true, real or important until you look at it more carefully
n. a form of air pollution that is or looks like a mixture of smoke and fog, especially in cities
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