小题1:B
小题2:A
小题3:B
小题4:C
小题5:B
本文主要讲述的是世界人口的增长。
小题1:细节理解题。根据文章第一段第二句可知。
小题2:细节理解题。根据文章第三段 more than 1 billion will live in sub-Saharan Africa可知。
小题3:细节理解题。根据图表可知。
小题4:细节理解题。Strain 指张力 ，压力。
小题5:细节理解题。根据图表可知人口变得越来越多。
The world’s population has reached 7 billion（十亿）according to
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