商店运来苹果4吨，比运来的桔子的2倍多34吨．运来桔子多少吨？

有实验表明细胞膜、内质网膜和高尔基体膜中具有一些相同的蛋白质，而且这类蛋白质在细胞膜中含量较少，在内质网中含量较多，在高尔基体中的含量介于两者之间。据此判断正确的是[ ]

A．这类蛋白质的分布说明细胞膜是由内质网直接转化而来

B．这类蛋白质的分布说明同一细胞中不同生物膜的成分、结构相同

C．这类蛋白质的分布说明高尔基体能够对蛋白质进行加工

D．这类蛋白质的分布说明生物膜在结构上具有统一性和差异性

人工皮炎的病因可能有（）。

A.多数患者应归于人格障碍

B.巨大的压力、某些药物的应用、虐待

C.持续接触某种有害物质

D.食用易引起过敏的食物

E.为逃脱自己的职责而做成疾患

常见的文件系统有哪些？

Teach for America (TFA) was founded by Wendy Kopp in 1990. It is a non-profit organisation that recruits top-notch graduates from elite institutions and gets them to teach for two years in struggling state schools in poor areas.

I had thought the programme was about getting more high-quality teachers — but that, it appears, is a secondary benefit. “This is about enlisting the energy of our country’s future leaders in its long-term educational needs, and eliminating inequity,” Wendy explains. It’s great if “corps members”, as TFA calls its active teachers, stay in the classroom — and many do, and rise quickly through the ranks.

But the “alums”, as she calls those who have finished their two-year teaching, who don’t stay in schools often go on to lead in other fields, meaning that increasing numbers of influential people in all walks of life learn that it is possible to teach successfully in low-income communities, and just what it takes. “It means you realise that we can solve this problem.”

As she continues to talk I realise that TFA is — in the best possible sense — a cult. It has its own language (“corps members”, “alums”), recruits are instilled (“We tell them that it can be done, that we know of hundreds, thousands, of teachers attaining tremendous success”), go through an ordeal (“Everyone hits the wall in week three in the classroom”), emerge transformed by privileged knowledge (“Once you know what we know — that kids in poor urban areas can excel — you can accomplish different things”) and can never leave (alumni form a growing, and influential, network). I have not seen the same zeal when talking to those on the equivalent programme in England, Teach First., in which the missionary-style language imported from America had to be toned down, because it just didn’t suit the restrained English style. But could that favour be necessary for its success

Chester, an alum, takes me to visit three TFA corps members at a middle school in the Bronx. They are impressive young people, and their zeal is evident. Two intend to stay in teaching; both want to open charter schools. One, a Hispanic woman, is working out with a friend how to educate migrant Hispanic labourers in Texas; the other would like to open a “green” charter, but in the meantime he has accepted a job with the KIPP charter group in Newark, New Jersey.

All three are tired. Their classrooms are not much like the rest of the school where they work, and their heroic efforts are only supported by Chester and each other, not by their co-workers. “The first year was unbelievably bad,” one tells me. “So many years with low expectations meant a lot of resistance from the kids. Eventually they saw the power and the growth they were capable of.”

The author is most likely（）

A. a graduate from elite institutions

B. an education correspondent

C. a TFA teacher

D. a Teach Firster

某企业利用其经济优势，违背交易相对人的意愿，搭配销售商品或附加其他不合理条件的行为，既属于《反不正当竞争法》中所规定的限制竞争行为，也属于《反垄断法》中规定的滥用市场支配地位的行为。( )