一家商店将某种衣服按成本价加价40%作为标价，又以8折卖出，结果每件服装仍可获利

已知抛物线y=-x²+2引抛物线的切线l，使l与两坐标轴在第一象限围成三角形的面积最小，求l的方程．

《水浒传》中武松身历的情节有（）

A、倒拔垂杨柳

B、醉打蒋门神

C、义释朱仝

D、大闹飞云浦

E、大闹十字坡

某地许多消费者投诉某品种的空调质量不好，制冷效果很差。对此，该品牌空调的总工程师回应说，空调之所以运转不正常，是因为当地的空气质量太差。
以下选项如果为真，能够最有效地反驳该_r程师的观点的是( )。

A．在空气质量良好的地区，该品牌的空调运转非常良好
B．该品牌空调在其他地区没有出现过大量的质量投诉
C．不是所有空涮的运转状态都受到空气质量的影响
D．所有的空调都应当保证能够在当地正常运转，才能够出售

For many people today, reading is no longer relaxation. To keep up their work they must read letters, reports, trade publications, interoffice communications, not to mention newspapers and magazines: a never ending flood of words. In (1) a job or advancing in one, the ability to read and comprehend (2) can mean the difference between success and failure. Yet the unfortunate fact is that most of us are (3) readers. Most of us develop poor reading (4) at an early age, and never get over them. The main deficiency (5) in the actual stuff of language itself—words. Taken individually, words have (6) meaning until they are strung together into phrases, sentences and paragraphs. (7) , however, the untrained reader does not read groups of words. He laboriously reads one word at a time, often regressing to (8) words or passages. Regression, the tendency to look back over (9) you have just read, is a common bad habit in reading. Another habit which (10) down the speed of reading is vocalization—sounding each word either orally or mentally as (11) reads.
To overcome these bad habits, some reading clinics use a device called an (12) , which moves a bar(or curtain) down the page at a predetermined speed. The bar is set at a slightly faster rate (13) the reader finds comfortable, in order to "stretch" him. The accelerator forces the reader to read fast, (14) word by word reading, regression and subvocalization practically impossible. At first (15) is sacrificed for speed. But when you learn to read ideas and concepts, you will not only read faster, (16) your comprehension will improve. Many people have found (17) reading skill drastically improved after some training. (18) Charlie Au, a business manager, for instance. His reading rate was a reasonably good 172words a minute (19) the training; now it is an excellent 1,378 words a minute. He is delighted that how he can (20) a lot more reading material in a short period of time.

A．for
B．in
C．after
D．before

彩弹配制的色浆，要用（）铜箩过滤.

A.100目

B.80目

C.200目

D.150目