单选题What is the main purpose of the passage?
A．To outline the research findings on the brain structur
B．To explain the link between sex and brain structur
C．To discuss the various factors that cause brain difference
D．To suggest new areas in brain researc
【定位】全文。
【解析】主旨题。题目问本文的主要目的是什么。文章第l、2段谈到男女大脑存存差异，该差异就在联结左右半脑的由2～3亿神经构成的胼胝体上。，女性的胼胝体比男性大，但这种差异有何意义，目前则尚不能确证。文章以主体部分说明性别差异可能与大脑之间的差异有关系，但均不能确定二者有必然联系。文章最后}人定，这种显著差异必然会有些作用的．并指出我们应当寻找智力过程中的不同之处。因此看来，选项D与文章末尾内容(即主旨所在处)一致，为正确选项。
【点睛】本文目的不是描述大脑的结构(选项A)，也不是讨论导致大脑差异的原因(选项C)。本文讨论性别差异与大脑的可能关系，与选项8也不一致。B指性别与大脑结构的关系，内容太过广泛。
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1TEXT D
Information is the primary commodity in more and more industries today.
By 2005, 83% of American management personnel will be knowledge workers. Europe and Japan are not far behind.
By 2005, half of all knowledge workers (22% of the labour force) will choose "flextime, flexplace" arrangements, which allow them to work at home, communicating with the office via computer networks.
In the United States, the so-called "digital divide" seems to be disappearing. In early 2000, a poll found, that, where half of white households owned computers, so did fully 43% of African-American households, and their numbers were growing rapidly. Hispanic households continued to lag behind, but their rate of computer ownership was expanding as well.
Company-owned and industry-wide television networks are bringing programming to thousands of locations. Business TV is becoming big business.
Computer competence will approach 100% in US urban areas by the year 2005, with Europe and Japan not far behind.
80% of US homes will have computers in 2005, compared with roughly 50% now.
In the United States, 5 of the 10 fastest-growing careers between now and 2005 will be computer related. Demand for programmers and systems analysts will grow by 70%. The same trend is accelerating in Europe, Japan, and India.
By 2005, nearly all college texts and many high school and junior high books will be tied to Internet sites that provide source material, study exercises, and relevant news articles to aid in learning. Others will come with CD-ROMs that offer similar resources.
Internet links will provide access to the card catalogues of all the major libraries in the world by 2005. It will be possible to call up on a PC screen millions of volumes from distant libraries. Web sites enhance books by providing pictures, sound, film clips, and flexible indexing and search utilities.
Implications: Anyone with access to the Internet will be able to achieve the education needed to, build a productive life in an increasingly high-tech world. Computer learning may even reduce the growing American prison population.
Knowledge workers are generally better paid than less-skilled workers. Their wealth is raising overall prosperity.
Even entry-level workers and those in formerly unskilled positions require a growing level of education. For a good career in almost any field, computer competence is a must. This is one major trend raising the level of education required for a productive role in today's work force. For many workers, the opportunity for training is becoming one of the most desirable benefits any job can offer. Information technology is expected to have impact on all the following EXCEPT
A．American management personne
B．European management personne
C．American people's choice of career
D．traditional practice at wor
3Which of the following statements is INCORRECT according to the passage?
A．By 2005 all college and school study materials will turn electroni
B．By 2005 printed college and school study materials will be supplemented with electronic materia
C．By 2005 some college and school study materials will be accompanied by CD-ROM
D．By 2005 Interact links make worldwide library search a possibilit
