（）是指整合的获取订单的战略，即企业用信息技术支持从客户初次联系到订货的整个销售周期

构成物质的粒子有分子、原子、离子．如水是由______构成的，氯化钠是由______构成的．

有关抗原抗体的亲和性和亲和力的描述，错误的是（）

A.亲和性是指抗体分子上一个抗原结合点与对应的抗原表位之间相互适应而存在的引力

B.抗体的亲和力是指抗体结合部位与抗原表位之间结合的强度，与抗体结合价直接相关

C.亲和性K值越大，其亲和力也就越大

D.抗原抗体反应的灵敏度与亲和性和亲和力无关

E.抗原抗体空间构象互补程度越高，亲和力越高

矿井需要的风量按井下同时工作的最多人数计算，每人每分钟供给风量不得少于4m3。

用来测量交流电流的钳形电流表，是由（）和（）组成的。

阅读理解。

     Too much TV-watching can harm children's ability to learn and even reduce their chances of

getting a college degree, new studies suggest in the latest effort to examine the effects of television

on children．

    One of the studies looked at nearly 400 northern California third-graders．Those with TVs in

their bedrooms scored about eight points lower on math and language arts tests than children

without bedroom TVs．

    A second study, looking at nearly 1000 grown-ups in New Zealand,found lower education

levels among 26-year-olds who had watched lots of TV during childhood．But the results don't

prove that TV is the cause and don't rule out(排除) that already poorly motivated(有动机的)

youngsters may watch lots of TV.

    Their study measured the TV habits of 26-year-olds between ages 5 and 15. Those with

college degrees had watched an average of less than two hours of TV per weeknight during

childhood, compared with an average of more than 2.5 hours for those who had no education

beyond high schools．  

    In the California study, children with TVs in their rooms but no computer at home scored the

lowest, while those with no bedroom TV but who had home computers scored the highest．

    While this study does not prove that bedroom TV sets caused the lower scores,it adds to

accumulating(增加) findings that children shouldn't have TVs in their bedrooms．

1. According to the California study, the low-scoring group might________.

A. have watched a lot of TV            

B. not be interested in math

C. be unable to go to college            

D. have had computers in their bedrooms

2. What is the researchers' understanding of the New Zealand study results?

A. Poorly motivated 26-year-olds watch more TV.

B. Habits of TV watching reduce learning interest．

C. TV watching leads to lower education levels of the 15-year-olds．

D. The connection between TV and education levels is difficult to explain．

3. What can we learn from the last two paragraphs?

A. More time should be spent on computers．

B. Children should be forbidden from watching TV.

C. TV sets shouldn't be allowed in children's bedrooms．

D. Further studies on high-achieving students should be done．