A.striving
B.experiencing
C.struggling
D.confronting

设A为3阶可逆矩阵，将A的第2行加到第l行得8，再将B的第l列的（-1)倍加

A.off
B.on
C.down
D.forward

Which of the following is not the“outside activities”in the eyes of scientists？
A.Writing scientific columns for the broader media．
B.Churning out books for commercial press．
C.Serving as an advisor in government panel．
D.Travelling to takc part in aft scientific seminar．

根据以下资料，回答下列各题： Why should we bother reading a book？All children say this occasionally．Many among our educated classes are also asking why，in a world of accelerating technology，increasing time poverty and diminishing attention spans，should they invest precious time sinking into a good book？ The beginnings of an answer lie in the same technology that has posed the question． Psychologists from Washington University used brain scans to see what happens inside our heads when we read stories．They found that“readers mentally simulate each new situation encountered in a narrative”．The brain weaves these situations together with experiences from its own life to create a new mental synthesis．Reading a book leaves US with new neural pathways． The discovery that our brains are physically changed by the experience of reading is something many of US will understand instinctively，as we think back to the way an extraordinary book had a transformative effect on the way we viewed the world．This transformation only takes place when we lose ourselves in a book，abandoning the emotional and mental chatter of the real world．That’S why studies have found this kind of deep readingmakes US more empathetic，or as Nicholas Cart puts it in his essay，The Dreams of Readers，“more alert to the inner ljves nf others”． This is significant because recent scientific research has also found a dramatic fall in empathy among teenagers in advanced western cultures．We can’t yet be sure why this is happening，but the best hypothesis is that it is the result of their immersion in the internet． So technology reveals that our brains are being changed by technology，and then offers a potential solution--the book． Rationally，we know that reading is the foundation stone of all education，and therefore an essential underpinning of the knowledge economy．So reading is——0r should be——an aspect of public policy．But perhaps even more significant is its emotional role as the．starting point for individual voyages of personal development and pleasure．Books can open up emotional and imaginative landscapes that extend the corridors of the web．They can help create and reinforce our sense of self． If reading were to decline significantly，it would change the very nature of our species．If we，in the future，are no longer wired for solitary reflection and creative thought，we will be diminished．But as a reader and a publisher，I am optimistic．Technology throws up as many solutions as it does challenges：for every door it closes，another opens．So the ability，offered by devices like e-readers，smartphones and tablets，to carry an entire library in your hand is an amazing opportunity．As publishers，we need to use every new piece of technology to embed long—form. reading within our culture．We should concentrate on the message．Not agonize over the medium． According to the psychologists from Washington University，reading a book will___ ．
A.create new mental experience that is totally different from real—life experience
B.make readers simulate what they have read in real life
C.bring tangible changes to the readers’brain
D.enhance the thinking capability of readers

According to the author，what should the government do about genetic test？
A.Inform. the public of the risk of it．
B.Legitimate the access to it．
C.Control the access to it．
D.Intervene when necessary．