问题 单项选择题 A1/A2型题

男性,28岁,头昏乏力、面色苍白2年余。检验:红细胞3.0×1012/L,血红蛋白70g/L,MCV、MCH、MCHC均低于正常;网织红细胞计数2%,血涂片见红细胞中央苍白区扩大,可见靶形红细胞。除哪项贫血外,其余均有可能()

A.珠蛋白生成障碍性贫血

B.缺铁性贫血

C.巨幼贫血

D.铁粒幼细胞贫血

E.慢性感染或慢性炎症性贫血

答案

参考答案:C

解析:巨幼红细胞性贫血时,MCV增高。小细胞低色素性贫血见于珠蛋白生成障碍性贫血、慢性病贫血、缺铁性贫血、铁幼粒细胞性贫血等;靶形细胞见于各种低色素性贫血、阻塞性黄疸、脾切除后;网织红细胞增高见于溶血性贫血、急性失血。巨幼细胞性贫血为大细胞正色素性贫血,与其他贫血有所不同。

单项选择题

"This is a really exciting time—a new era is starting," says Peter Bazalgette, the chief creative officer of Endemol, the television company behind "Big Brother" and other popular shows. He is referring to the upsurge of interest in mobile television, a nascent industry at the intersection of telecoms and media which offers new opportunities to device-makers, content producers and mobile- network operators. And he is far from alone in his enthusiasm.

Already, many mobile operators offer a selection of television channels or individual shows, which are " streamed" across their third-generation (3G) networks. In South Korea, television is also sent to mobile phones via satellite and terrestrial broadcast networks, which is far more efficient than sending video across mobile networks; similar broadcasts will begin in Japan in April. In Europe, the Italian arm of 3, a mobile operator, recently acquired Canale 7, a television channel, with a view to launching mobile-TV broadcasts in Italy in the second half of 2006. Similar mobile-TV networks will also be built in Finland and America, and are being tested in many other countries.

Meanwhile, Apple Computer, which launched a video-capable version of its iPod portable music-player in October, is striking deals with television networks to expand the range of shows that can be purchased for viewing on the device, including "Lost", "Desperate Housewives" and "Law & Order". TiVo, maker of the pioneering personal video recorder (PVR), says it plans to enable subscribers to download recorded shows on to iPods and other portable devices for viewing on the move. And mobile TV was one of the big trends at the world’s largest technology fair, the Consumer Electronics Show, which took place in Las Vegas this week.

Despite all this activity, however, the prospects for mobile TV are unclear. For a start, nobody really knows if consumers will pay for it, though surveys suggest they like the idea. Informa, a consultancy, says there will be 125 million mobile-TV users by 2010. But many other mobile technologies inspired high hopes and then failed to live up to expectations. And even if people do want TV on the move, there is further uncertainty in three areas: technology, business models and the content itself.

Paragraph 2 is written to()

A. indicate the test of mobile-TV networks

B. illustrate the widespread interests in mobile TV

C. stress the selection of television channels

D. assess the third-generation (3G) networks

填空题