关于原发性骨髓纤维化，下列说法不正确的是（）
A.是克隆性骨髓增生性疾病
B.骨髓巨核系明显增生
C.骨髓粒系增生减低
D.纤维组织并非肿瘤性增生
E.外周血可出现幼稚粒细胞和（或）幼稚红细胞
参考答案：C
解析：原发性骨髓纤维化是克隆性恶性增殖性疾病，其缺陷在多能干细胞，主要病理表现为骨髓的纤维化。疾病早期，骨髓造血细胞仍可增生，特别是粒系和巨核系细胞。血涂片可见有核红细胞，多为中、晚幼红细胞，也可见中、晚幼粒细胞，偶见原始粒细胞。
Many people believe that 3G mobile phones will be used in almost all everyday activities. It____that we won’t go shopping because most things will be available(可得到的) on the Internet. There will be no more____ because all texts will be available in electronic libraries. The Internet will be used to plan holidays, rent films and_____ food. Most telephone calls will be ____ by 3G mobile phones as well.
Some people are ____ about the new development. Others, however, don’t think that 3G mobile phones will replace the old __ of shopping and communicating.
Let’s look at books, for example. Some people believe that one day we won’t read books made of paper. ____, we’ll read books by using 3G mobile phones. These mobile phones will store the contents（内容）of many different books at the same time. We won’t need to turn lots of pages and paper will be ____. Is the Internet shopping as fun as traditional shopping? Many people say it’s not. It’s __ _ to go into shops and look at things. It’s also___ that most people will want to read books on their 3G mobile phones. Maybe 3G mobile phones won’t change these two habits.
| 小题1: | A．is thinking B．has thought C．is thought D．to think |
| 小题2: | A．dictionaries B．people C．letter D．books |
| 小题3: | A．order B．heat C．eat D．cook |
| 小题4: | A．built B．made C．bought D．used |
| 小题5: | A．afraid B．interested C．worried D．excited |
| 小题6: | A．ways B．time C．places D．houses |
| 小题7: | A．Besides B．However C．Instead D．So |
| 小题8: | A．sold B．saved C．wasted D．collected |
| 小题9: | A．boring B．interested C．terrible D．fun |
| 小题10: | A．important B．comfortable C．impossible D．normal |