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阅读理解。 My bookshelves are full of dust-and with good reason. When it comes to cleaning that part of my home, I suffer from the most serious case of avoidance (回避反应症). The thing is this: when I do set out to clean and re-organize my books, which seldom happens, I place myself into a really bad situation. No sooner do I take a title from the shelf, blow off the dust, and wipe down the cover than I find myself sitting on the floor with legs crossed and my back against the wall. Pretty soon books get piled up on my legs as I am reunited with old friends. It is as if these books have voices, and each wants to say its piece. 'Remember me? I was given to you when you went into the Navy, so that you would never lack for companionship,' one whispers. Another says, 'I was your first book of poems, given to you before you learned to love poetry.' And a third, 'I was the book that made history so attractive to you.' Perhaps the greatest pleasure of re-organizing my books are the surprises-or better said, reunions-that occur. During my latest book-cleaning adventure, I found one that had fallen behind the shelf:'Tales of Edgar Allan Poe.' Not an unusual title, but the words written on the first page made it very special:'With Love from Mom and Dad, Christmas 1965.' What's this? A book on the physics of lasers (激光). It is filled with mathematical statements, and I had bought it at a library sale when I was 12, not long after the laser had been invented. I couldn't understand a bit of it, but I did learn what 'laser' meant. What I end up with when I empty my bookshelves is a cross-section (横剖面) of my personal history. It's like a road cut where one sees all the layers of rock going back through time to the beginning of the simplest life forms. The books I've read-and kept-are not just old friends. They are my résumé . 1. What could be said about the author? A. He is too busy to tidy up his bookshelves. B. He considers his books treasured possessions. C. He has made a lot of notes in his books. D. He is a lover of science books. 2. By saying that his books have voices, the author means _____. A. they bring back happy memories B. they are recorded in human voice C. they say a lot about human history D. they offer good topics for discussion 3. What does the author enjoy most from re-organizing his books? A. Finding some missing books. B. Putting books in good order. C. Learning something new from the books. D. Rediscovering interesting stories behind some books. 4. The underlined word 'résumé' in the last paragraph probably means _____. A. personal history B. precious notes C. good companion D. simple life forms
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参考答案:
举一反三
【判断题】若n 阶矩阵A 可逆,则其伴随矩阵 也可逆.
A.
正确
B.
错误
【简答题】按过滤效率,空气过滤器分为几类?请阐明各自的适用范围。
【单选题】若n阶方阵A可逆,且伴随矩阵A*也可逆,则A*的逆矩阵为 ( )
A.
A
B.
C.
A
D.
·2
E.
F.
【判断题】n阶矩阵A可逆,则A*也可逆.
A.
正确
B.
错误
【判断题】空气过滤器的分类中,超高效过滤器的过滤效率是以过滤0.12μm的微粒为准的。( )
A.
正确
B.
错误
【判断题】阶矩阵 可逆,则 也可逆.( )
A.
正确
B.
错误
【判断题】阶矩阵 可逆,则 也可逆 .
A.
正确
B.
错误
【单选题】在同一层若干电信间之间应设置( )路由。
A.
水平
B.
干线
C.
建筑物
D.
远程
【单选题】国家标准《空气过滤器》(GB/T14295—1993)把空气过滤器分为四类,以下不属于空气过滤器的是( )。
A.
粗效
B.
亚高效
C.
亚中效
D.
高中效
【判断题】若 阶矩阵 可逆,则它的伴随矩阵 也可逆。
A.
正确
B.
错误
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