One should tell the boss fight away that he is leaving when______

单项选择题It can be inferred from the third paragraph that diseconomy means______

单项选择题The abbreviation WPI in the last paragraph may refer to______.

单项选择题In traffic lights, red can only mean stop. But in human languages, limited phonemes can form numerous words which can form unlimited sentences. This is a good illustration of the ______ feature of language.

单项选择题Most of Hardy’s novels are set in ______, the fictional primitive and crude region which is really the home place he both loves and hates.

单项选择题How many families are mentioned in the text