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A.To apply for City College.B.To fight for his own futureC.To break away from his parents.D.To live up to his parents'expectations.27.What does the author suggest people do to deal with dropouts?A.Try to be understanding.B.Push them to the limit.C.Open their hearts to them.D.Encourage them to be friendly.CLiving with your parents has its benefits at least when it comes to raising your kids-theirgrandkids.Two new studies add to the evidence that grandmothers can enhance the survival ofgrandchildren.That is,unless grandma's too old or lives too far away.Humans are unusual in that the females live long past the age at which they stop havingbabies.Patrick Bergeron,professor of biology at Bishop's University in Quebee,sad that most ofthe organisms will reproduce up to their very last moment.This increase is often explaned by theso-called "grandmother effect".He thinks there could still be a benefit for women who stophaving babies to increase their genetic footprint by helping their daughters to raise larger families.To explore the“grandmother effect'”hypothesis(假设，Bergeron and his colleaguesexamined nearly 200 years'worth of French-Canadian population records from the 17th and 18thcenturies."At the time,life was tough.In some years,a third of the kids were not even making itto one year of age."But the researchers found that having a grandmother still alive was a definiteplus."Families with grandmothers alive were larger by about two and the survival of thesegrandchildren to age 15 was much improved."This beneficial effect was only seen when the matriarchs (lived nearby.That role istougher for them to fulfill as they get older in poor health,which brings us to the second study.The researchers found that the benefits associated with having a grandmother on hand dependedon her age.Once manna hit 75.the grandchild survival benefit disappeared.This was almostcertainly due to some form of indirect resource competition,though,rather than wickedness (on the part of co-resident grandmothers.So a healthy grandma helps make for a healthy grandchild.If "over the river and through thewoods to grandmother's house"isn't too long a trip.28.What's the second paragraph mainly about?A.Differences between animals and human beings.B.Disadvantages of living with grandmasC.Grandmothers'influence on the kids.D.Definition of"grandmother effect".29.How does the writer describe about the French-Canadian population more than three hundredyears ago?A.By voicing opinions.B.By providing facts.C.By giving assumptions.D.By telling stories.30.What can we infer from the second study?A.Society should be concerned about the old women.B.Grandmothers over 75 years old are unwilling to help.C.Some grandmothers may occupy kids'relative recourses.D.Some grandmothers are getting wicked after they are old.31.Which of the following can be the most helpful grandmother according to the passage?A.A healthy one living nearby.B.A healthy one living abroad.C.An old one living in a nursing home.D.A knowledgeable one living together.试卷第5页，共9页