多元线性回归分析中，要求的条件有（） A.应变量y是服从正态分布的随机变量 B.自变

下表是2012年10月10日和2013年10月10日两天的外汇牌价(人民币元/100美元)。一般说来，这意味着 (　　)

2012年10月10日	634.41
2013年10月10日	614.52

①有利于美国对中国的出口         ②有利于中国对美国的出口

③外币汇率跌落，人民币汇率升高   ④外币汇率升高，人民币汇率跌落

A．①③            B.②④             C.①④                D.②③

关于上消化道出血急症剖腹探查，下列说法正确的是（）。

A.术中应按胃、十二指肠、肝、脾、胆道和空肠上段依次检查

B.可纵形切开胃前壁，进行胃腔和胃壁检查

C.空肠检查可采用无影灯透照或分段检查

D.术中可配合内镜和血管造影检查

E.术中可用卵圆钳夹一干净纱布塞住贲门或幽门，来判断食管或十二指肠出血

Play is the basic business of childhood, and in recent years research has shown the great impor­tance of play in the development of a human being. From earliest infancy (婴儿), every child needs opportunity and the right materials for play, and the main tools of play are toys. The main function of toys is to suggest, encourage and play. To succeed in this, they must be good toys, which children will play with often, and will come back to again, and again. Therefore it is important to choose suit­able toys for different stages of a child’s development.

In recent years research on infant development has shown that the standard a child is likely to reach, within the range of his inherited (遗传的) abilities, is largely determined in the first three years of his life. So a baby’s ability to benefit from the right play materials should not be underestimated. A baby who is encouraged, talked to and shown things and played with, has the best chance of growing up successfully.

In the next stage, from three to five years old, curiosity knows no bounds. Every type of suitable toys should be made available to the child, for trying out, experimenting and learning, for discovering his own particular ability: Bricks and jigsaws (七巧板) and construction toys; painting, scribbling (涂鸦) and making things; sand and water play;toys for imaginative and pretending play — the first so­cial games for learning to play and get on with others.

But at the third stage of play development — from five to seven or eight years old — the child is at school. But for a few more years play is still the best way of learning, at home or at school. It is easier to see which type of toys the child most enjoys.

Until the age of seven or eight, play and work mean much the same to a child. But once reading has been mastered, then books become the main source of learning. Toys are still interesting and val­uable, which lead up to new hobbies, but their significance has changed — to a child of nine or ten years old, toys and games mean, as to adults, relaxation and fun.

小题1:according to the first passage we know that as a child grows up________.

A．he should be allowed to choose his own toys

B．he should be given the same toys

C．he should be given different toys

D．he should be given fewer and fewer toys小题2:according to the passage, the abilities a child has inherited from his parents________.

A．determine his character

B．will not change after the age of three

C．partly determine the standard he is likely to reach

D．to a large extent determine the choice of toys小题3:We learn from the passage that a child has boundless curiosity________.

A．when he is two

B．when he is around four

C．when he is six

D．when he is eight小题4: The passage is mainly about________.

A．the importance of pre-school education

B．the importance of schooling

C．the role of play in a child’s development

D．the choice of toys for youngster

引起变应性接触性皮炎的接触物本身是具有强烈刺激性的，任何人接触后均可发病。

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