设直线的参数方程是x=2+12ty=3+32t，那么它的斜截式方程是______

已知{a_n}是一个等差数列，且a₂=1，a₅=-5．

（Ⅰ）求{a_n}的通项a_n；

（Ⅱ）求{a_n}前n项和S_n的最大值．

计算结果掩盖了高浓度参数的影响的是（）

A.比值简单叠加型大气质量指数

B.兼顾最高分指数和平均分指数的大气质量指数

C.分段线型函数型大气质量指数

D.水质评分加权型指数

E.比值算术平均型大气质量指数

班杜拉认为，模仿的形式包括【】

A．直接模仿

B．间接模仿

C．综合模仿

D．象征模仿

E．抽象模仿象征模仿

企业的形象包括（）。

A.产品品牌

B.内部形象

C.企业社会责任感

D.领导形象

Although there are many skillful Braille readers, thousands of other blind people find it difficult to learn that system. They are thereby shut (1) from the world of books and newspapers, having to (2) on friends to read aloud to them.

A young scientist named Raymond Kurzweil has now designed a computer which is a major (3) in providing aid to the (4) .His machine, Cyclops, has a camera that (5) any page, interprets the print into sounds, and then delivers them orally in a robot-like (6) through a speaker. By pressing the appropriate buttons (7) Cyclops’s keyboard, a blind person can "read" any (8) document in the English language.

This remarkable invention represents a tremendous (9) forward in the education of the handicapped. At present, Cyclops costs $ 50,000. (10) , Mr. Kurzweil and his associates are preparing a smaller (11) improved version that will sell (12) less than half that price. Within a few years, Kurzweil (13) the price range will be low enough for every school and library to (14) one. Michael Hingson, Director of the National Federation for the Blind, hopes that (15) will be able to buy home (16) of Cyclops for the price of a good television set.

Mr. Hingson’s organization purchased five machines and is now testing them in Maryland, Colorado, Iowa, California, and New York. Blind people have been (17) in those tests, making lots of (18) suggestions to the engineers who helped to produce Cyclops.

"This is the first time that blind people have ever done individual studies (19) a product was put on the market," Hingson said. "Most manufacturers believed that having the blind help the blind was like telling disabled people to teach other disabled people. In that (20) , the manufacturers have been the blind ones.

11（）

A.but

B.than

C.or

D.then