18．For over a million years，our forefathers were basicall一
A．successful famers
B．co－operating hunters
C．runners and jumpers
D．skillful sportsmen
19．When did hnuting for animals become out of date for our forefathers？
A、About a million years ago，
B．About 10，000 years ago．
C．Several thousand years ago．
D．The answer is not given．
20．which of the following best summarizes the main idea of the passase？
A．It is farming that gives human beings enough leisure time for sporting activities·
B.Farming is very important in human civilization because it saves human beings from risks and uncertainties of hunting for survival
C．It is hunting that provides human beings with much simpler ways of obtaining meaty meals
D．Sporting activities satisfy the desire of modern man to exercise hunting skills which his forefathers developed for survival.
Questions 26-30 are based on the following Passage：
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