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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()。
The author thinks the housework of a modern home is __________．
[A] toilsome
[B] irritating
[C] unfulfilling [D] undemanding
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