题目内容

According to the passage, the poverty-stricken people __________．
[A] have encountered new problems
[B] have become fewer on the whole
[C] will cast off poverty soon
[D] live and work in peace

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正确答案是（）
[A] However
[B] Therefore
[C] And
[D] Then

根据听到的内容，回答 27～29 题
第 27 题 The advantages of the new treatment include all the following EXCEPT __________．
[A] lower cost
[B] more convenience [C] fewer side effects
[D] more effectiveness

根据听到的内容，回答下面题
What drove people of Ivory Coast into neighboring countries？
[A] Regional poverty.
[B] National disaster.
[C] Insecure political condition.
[D] Violent demonstration.

从经济学理论上说，存在正外部性时会造成()。