15．The main idea of the last paragraph is ________.

　　A．the advantages of increased migration

　　B．the problem of declining and aging population

　　C．how to increase migration

　　D．some ways to enrich a country's culture

　　解析：选A　段落大意题。最后一段的中心句是该段第一句。由该句和下文可知，本段主要说明了增加移民的好处。故选A项。

　　Ⅱ.阅读七选五

　　(2016·河北省唐山市统一考试)You may have grown up living with sisters and brothers, or this may be your first time sharing your living space with someone else. __1__ However, it can also be a great part of your college experience. Follow these tips to make sure you and your roommate keep things pleasant and supportive throughout the year.

　　Be clear from the beginning.

　　Maybe you hate it when someone interrupts you when you are sleeping every morning. Maybe you need ten minutes before talking to anyone after you wake up. __2__ It's not fair to expect him or her to pick up on them right away, and communicating what you need is one of the best ways to get rid of problems before they become problems.

　　__3__

　　This may seem simple, but it's probably one of the biggest reasons why roommates experience conflicts. Don't you think he'll mind if you borrow his shoes for a quick soccer game? For all you know, you just step over an uncrossable line. Don't borrow, use, or take anything without getting permission first.

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