根据下面材料，回答第 31～35 题：

第 31 题 We can infer from the first paragraph that _______.（　　）

[A] the past central operating assumption conforms to the present condition

[B] the poor in middle-income countries have outnumbered those in Africa

[C] most of the impoverished "bottom billion" have emigrated from Africa

[D] the poor in middle-income countries are quite odd in behavior.

第 48 题

第 47 题

第 45 题

第 46 题

第 43 题

第 44 题

第 42 题

第 40 题 The tone of the text c

• an
• be best des
• cribe
• d as（　　）    [A] confident and optimistic    [B] scientific and detached    [C] discouraged and alarmed    [D] polite and sensitive

根据下面材料，回答第 41～45 题：

第 41 题

第 38 题

• According to the text, family sta
• bility depends on ________.（　　）    [A] the
• coupies' earning ability    [B] a network of social an
• d legal support    [C] how much possessions the couple have before marriage    [D] the relative balance between the benefits and costs of marriage