我们通常可以通过以下( )标准来划分正常行为和偏差行为A．内省经验标准 B．统计学

齿面点蚀是由于呈（）变化作用着的（）引起的；发生在（）部位。

叶酸主要用于治疗

A．慢性失血导致的贫血

B．妊娠期巨幼红细胞性贫血

C．乙胺嘧啶所致巨幼红细胞牲贫血

D．再生障碍性贫血

E．溶血性贫血

工业接触法制硫酸的吸收塔排出的尾气先用氨水吸收，再用浓硫酸处理，得到较高浓度的SO₂和铵盐。为测定该铵盐中氮元素的质量分数，将不同质量的铵盐分别加入到58.00mL相同浓度的NaOH溶液中，沸水浴加热至气体全部逸出(此温度下铵盐不分解)。该气体经干燥后用浓硫酸吸收完全，测定浓硫酸增加的质量。

部分测定结果如下表；

试计算：该铵盐中氮元素的质量分数是                             

A．12.15%

B．21.50%

C．14.56%

D．无法确定

In her new book, “The Smartest Kids in the World,” Amanda Ripley, an investigative journalist, tells the story of Tom, a high-school student from Gettysburg, Pennsylvania, who decides to spend his senior year in Wroclaw, Poland. Poland is a surprising educational success story: in the past decade, the country raised students’ test scores from significantly below average to well above it. Polish kids have now outscored American kids in math and science, even though Poland spends, on average, less than half as much per student as the United States does. One of the most striking differences between the high school Tom attended in Gettysburg and the one he ends up at in Wroclaw is that the latter has no football team, or, for that matter, teams of any kind.

That American high schools lavish more time and money on sports than on math is an old complaint. This is not a matter of how any given student who plays sports does in school, but of the culture and its priorities. This December, when the latest Program for International Student Assessment(PISA) results are announced, it’s safe to predict that American high-school students will once again display their limited skills in math and reading, outscored not just by students in Poland but also by students in places like South Korea, Belgium, the Netherlands, Finland, Singapore, and Japan. Meanwhile, they will have played some very exciting football games, which will have been breathlessly written up in their hometown papers.

Why does this situation continue? Well, for one thing, kids like it. And for another, according to Ripley, parents seem to like the arrangement, too. She describes a tour she took of a school in Washington D.C., which costs thirty thousand dollars a year. The tour leader—a mother with three children in the school—was asked about the school’s flaws. When she said that the math program was weak, none of the parents taking the tour reacted. When she said that the football program was weak, the parents suddenly became concerned. “Really?” one of them asked worriedly, “What do you mean?”

One of the ironies of the situation is that sports reveal what is possible. American kids’ performance on the field shows just how well they can do when expectations are high. It’s too bad that their test scores show the same thing. 

小题1:Tom decides to spend his senior year in Poland because _______.

A．he intends to improve his scores

B．Polish kids are better at learning

C．sports are not supported at schools in Gettysburg

D．there are striking differences between the 2 countries小题2:According to Paragraph 2, we know that _______.

A．PISA plays a very important role in America

B．little time is spent on sports in Japanese schools

C．American high schools complain about sports time

D．too much importance is placed on sports in America小题3:The underlined sentence in the last paragraph means _______.

A．low expectations result in American students’ poor PISA performance

B．high expectations push up American students’ academic performance

C．American students’ academic performance worries their parents a lot

D．lacking practice contributes to American students’ average performance小题4:The purpose of this article is to _______.

A．compare Polish schools with those in America

B．call on American schools to learn from the Polish model

C．draw public attention to a weakness in American school tradition

D．explain what is wrong with American schools and provide solutions

对应收账款函证时，发出肯定式询证函未能在规定时期回复，应再寄出第二次询证函，二次发出仍得不到回复的原因可能有______。

A．账款已还，不愿再回复

B．一方或双方记账错误

C．被审计单位弄虚作假

D．购销双方存在争议

E．坏账损失发生