Family planning experts worry in particular about the future population explosion in Sub­Saharan Africa.In May，the United Nations projected the world population would reach 9.3 billion in 2050 and 10.1 billion by 2100.Much of that growth will come from Africa，where the population is growing at 2.3 percent a year—more than double Asia’s 1 percent growth rate.If that rate stays consistent，which is not certain，Africa’s population will reach 3.6 billion by 2100 from the present 1 billion.

　　Joel Cohen，a professor of population studies at Rockefeller University and Columbia University in New York，said universal secondary education offered a way to reduce population in high birth rate regions.In addition to providing information about birth control，a secondary education teaches women to reduce their own fertility，improve the health of their children and allows them to move from a mindset of having many children in the hope that some will survive to improve the quality of each child’s life，Cohen wrote in the journal Nature.

　　1．In the first paragraph，the author introduces his topic by________.

　　A．giving an example

　　B．explaining the author’s opinions

　　C．describing the poor education system

　　D．coming straight to the topic

　　2．What can we learn from the passage?

　　A．Robinson is happy after talking to the Ethiopian girl.

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