题目内容:
WhatdoestheexampleofIndiaillustrate?
A.Wealthypeople.tendtohavefewerchildrenthanpoorpeople. B.Naturalselectionhardlyworksamongtherichandthepoor.
C.Themiddleclasspopulationis80%smallerthanthatofthetribes.
D.Indiaisoneofthecountrieswithaveryhighbirthrate.
参考答案:
答案解析: