D) providing accommodation for smokers.

　　4. As is suggested, the common solution to the common problem is

　　A) To separate people from people

　　B) To work together in mutual accommodation

　　C) To make us more keenly aware of choice

　　D) To serve societys interests better.

　　5. According to the passage, the writer looks upon the anti-smoking wall-builders actions

　　A) optimistically

　　B) pessimistically

　　C) unconcernedly

　　D) skeptically

　　key: DDABD

　　PASSAGE 28

　　Diseases of Agricultural Plants

　　、Plants, like animals, are subject to diseases of various kinds. It has been estimated that some 30,000 different diseases attack out economic plants: forty are known to attack corn, and about as many attack wheat. The results of unchecked plant disease are all too obvious in countries which have marginal food supplies. The problem will soon be more widespread as the population of the world increases at its frightening rate. Even in countries which are now amply fed by their agricultural products there could soon be critical food shortages. It is easy to imagine the consequences of some disastrous attack on one of the major crops; the resulting famines could kill millions of people, and the resulting hardship on other millions could cause political upheavals disastrous to the order of the world.

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