2017年扬州大学804西方法律思想史考研真题考研试题硕士研究生入学考试试题

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who got a cold, the ones who felt greater social support and Cohen, a professor of psychology at Carnegie. Hugging "is a benefits of hugging to the release of oxytocin, often called "the relationships, including that between mother and their newborn babies. Oxytocin is made primarily in the central lower part of the brain , and some of it is released into the bloodstream. But physiology. 1.[A] Unlike [B] Besides [C] Despite [D] Throughout 【答案】[B] Besides 2.[A] connected [B] restricted [C] equal [D] inferior 【答案】[A] connected

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Section I Use of English Directions: Read the following text. Choose the best word (s) for each numbered blank and mark A, B, C or D on the ANSWER SHEET. (10 points) Could a hug a day keep the doctor away? The answer may be a resounding “yes!” 1 helping you feel close and 2 to people you care about, it turns out that hugs can bring a 3 of health benefits to your body and mind. Believe it or not, a warm embrace might even help you 4 getting sick this winter. In a recent study 5 over 400 health adults, researchers from Carnegie Mellon University in Pennsylvania examined the effects of perceived social support and the receipt of hugs 6 the participants’ susceptibility to developing the common cold after being 7 to the virus .People who perceived greater social support were less likely to come 8 with a cold ,and the researchers 9 that the stress-reducing effects of hugging 10 about 32 percent of that beneficial effect. 11 among those who got a cold, the ones who felt greater social support and received more frequent hugs had less severe 12 . “Hugging protects people who are under stress from the 13 risk for colds that’s usually 14 with stress,” notes Sheldon Cohen, a professor of psychology at Carnegie. Hugging “is a marker of intimacy and helps 15 the feelin g that others are there to help 16 difficulty.” Some experts 17 the stress-reducing , health-related benefits of hugging to the release of oxytocin, often called “the bonding hormone” 18 it promotes attachment in relationships, including that between mother and their newborn babies. Oxytocin is made primarily in the central lower part of the brain , and some of it is released into the bloodstream. But some of it 19 in the brain, where it 20 mood, behavior and physiology. 1．[A] Unlike [B] Besides [C] Despite [D] Throughout 2．[A] connected [B] restricted [C] equal [D] inferior 3．[A] choice [B] view [C] lesson [D] host 4．[A] recall [B] forget [C] avoid [D] keep 5．[A] collecting [B] involving [C] guiding [D] affecting 6．[A] of [B] in [C] at [D] on 7．[A] devoted [B] exposed [C] lost [D] attracted 8．[A] across [B] along [C] down [D] out 9．[A] calculated [B] denied [C] doubted [D] imagined 10．[A] served [B] required [C] restored [D] explained 11．[A] Even [B] Still [C] Rather [D] Thus 12．[A] defeats [B] symptoms [C] tests [D] errors 13．[A] minimized [B] highlighted [C] controlled [D] increased

(完整版)2017年全国考研数学三真题

2017年全国硕士研究生入学统一考试真题试卷 《数学三》试题 一、选择题:1—8小题．每小题4分，共32分． 1 ．若函数0(),0x f x b x >=?≤?在0x =处连续，则 （A ）12ab = （B ）1 2 ab =- （C ）0ab = （D ）2ab = 2．二元函数(3)z xy x y =--的极值点是（ ） （A ）(0,0) （B ）03(,) （C ）30(,) （D ）11(,) 3．设函数()f x 是可导函数，且满足()()0f x f x '>，则 （A ）(1)(1)f f >- （B ）11()()f f <- （C ）11()()f f >- （D ）11()()f f <- 4． 若级数21 1sin ln(1)n k n n ∞ =??--??? ?∑收敛，则k =（ ） （A ）1 （B ）2 （C ）1- （D ）2- 5．设α为n 单位列向量，E 为n 阶单位矩阵，则 （A ）T E αα-不可逆 （B ）T E αα+不可逆 （C ）2T E αα+不可逆 （D ）2T E αα-不可逆 6．已知矩阵200021001A ?? ?= ? ???，210020001B ?? ?= ? ???，100020002C ?? ? = ? ??? ，则 （A ）,A C 相似，,B C 相似 （B ）,A C 相似，,B C 不相似 （C ）,A C 不相似，,B C 相似 （D ）,A C 不相似，,B C 不相似 7．设,A B ，C 是三个随机事件，且,A C 相互独立，,B C 相互独立，则A B 与C 相互

（A ）,A B 相互独立 （B ）,A B 互不相容 （C ）,AB C 相互独立 （D ）,AB C 互不相容 8．设12,, ,(2)n X X X n ≥为来自正态总体(,1)N μ的简单随机样本，若1 1n i i X X n ==∑，则 下列结论中不正确的是（ ） （A ）21()n i i X μ=-∑服从2χ分布 （B ）()2 12n X X -服从2χ分布 （C ）21 ()n i i X X =-∑服从2χ分布 （D ）2()n X μ-服从2χ分布 二、填空题（本题共6小题，每小题4分，满分24分. 把答案填在题中横线上） 9 ．3(sin x dx π π -+=? ． 10．差分方程122t t t y y +-=的通解为 ． 11．设生产某产品的平均成本()1Q C Q e -=+，其中产量为Q ，则边际成本为 . 12．设函数(,)f x y 具有一阶连续的偏导数，且已知(,)(1)y y df x y ye dx x y e dy =++， (0,0)0f =，则(,)f x y = 13．设矩阵101112011A ?? ? = ? ??? ，123,,ααα为线性无关的三维列向量，则向量组123 ,,A A A ααα的秩为 ． 14．设随机变量X 的概率分布为{}1 22 P X =-=，{}1P X a ==，{}3P X b ==，若0EX =，则DX = ．