题目内容：
By citing the fact that "the number had shrunk to 39 out of 220" ( Line 3-4, Para.2), the author sug- gests that _______.（ ）
A． the poverty in the middle-income countries is alleviated tremendously B． the life of children in the middle-income countries has become better
C． poor people's living conditions don't change although the number reduced
D． the financial aid to the world's poorest countries achieves great success
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答案解析：