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11.若不等式x^2+y^2+2-m(x+y)0对任意正数x,y恒成立,则实数m的取值范围是A.[2,+∞)B.(-,12)C.(-∞,2]D.(-∞,3)
第一节 (共15小题;每小题1分,满分15分)阅读下面短文,从每题所给的A、B、C、D四个选项中选出可以填入空白处的最佳选项。For more than five decades, Marybeth Hearn has raised 56 dogs to assist the blindpeople. But her act of kindness doesn’t 41 there. The recently retired high school teacherhas inspired generations of students to 42 m any more.When Hearn was about 10 years old, she told her 43 that she decided to train a guideWhe ea sd fathercrtly oubted whether she could find an v one to ayo thedog. But her mother and at her secretly doubted whether she could fnd anyone to pay for the44 ol the training . Hearn was so 4 that she presented the project to so many relatedorganizations that she 46 raised $2, 500. So on a sunny day, the family drove home witha black dog sitting in the backseat, the first of a long string of 4Later, her children and grandchildren have 48 in her footsteps. But her greatestLaimpact has come from 49 generations of student trainers who since 1992 have 50 with170 dogs that ended up in a range of service posts.Each new dog lives full-time for 14 months with a student trainer, who will teach it51 skills like behaving itself in public. It also accompanies the student to the classes tobecome socialized.“If you can imagine a(n) 52 with 21 dogs and 30 kids, it’s quiteamazing, ”Hearn said at her recent retiring ceremony.