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 _______.（ ）
the poverty in the middle-income countries is alleviated tremendously
the life of children in the middle-income countries has become better
poor people's living conditions don't change although the number reduced
the financial aid to the world's poorest countries achieves great success
参考答案：