问题 单项选择题

多毛细胞白血病骨髓中存在的多毛细胞特点不包括()

A.酸性磷酸酶阳性,不被酒石酸抑制

B.突出的特点是边缘不整齐

C.超微结构可见胞质中有特异性包涵体核糖体板层复合物

D.多数病例表现为一致和独特的T细胞表型

E.与大淋巴细胞相似

答案

参考答案:D

解析:毛细胞突出的特点是边缘不整齐,呈锯齿状或伪足状,有许多不规则纤绒毛突起,也称“毛发”状突起。超微结构检验:扫描电镜(SEM)示毛细胞表面有较多的散射的细长毛状突出,最长可超过4μm,延伸的“毛.”有交叉现象,部分细胞表面呈皱褶状突起。透射电镜(TEM)示毛细胞表面有长绒毛和伪足,胞质内可见到特征性的RLC。细胞化学染色:POX、NAP和SBB染色呈阴性反应,非特异性酯酶呈阴性或弱阳性,不被NaF抑制,半数病例PAS染色阳性。具有特征性的染色是ACP染色阳性,不被左旋(L)酒石酸抑制(TRAP),阳性率达41%~100%。免疫学检验:多数病例表现为一致和独特的B细胞的表型,即膜表面免疫球蛋白(Smlg)大部分阳性。白血病细胞免疫表型的特点是CD11、CD22、CD25和CD103等表面抗原高表达。同时可有B细胞表面抗原协同表达,如CD19和CD20。而CD21等均阴性。

阅读理解

Ask any person who is successful in whatever he or she is doing what motivates him/her, and very likely the answer will be "goals". Goal Setting is extremely important to motivation and success. So what motivates you? Why are you in college? If you are in college because that's what your parents want, you may find it difficult to motivate yourself. Sure, it's possible to succeed with someone else providing the motivation for you. ("If you graduate from college, I'll give you a car!" or worse "If you don't graduate from college, you won't get a car.") But motivation that comes from within really makes the difference.

Certainly, you need some intelligence, knowledge base, study skills, and time management skills, but if you don't have motivation, you won't get far. Think about this analogy. You have a car with a full tank of gas, a well-tuned engine, good set of tires, quadraphonic CD system, and a sleek, polished exterior(外表). There it sits. This car has incredible potential. However, until a driver sits behind the wheel, puts the key in the ignition(点火装置), and cranks it up, the car doesn't function. You guessed it; the KEY is MOTIVATION.

Interest is an important motivator for a student. So is a desire to learn. When you link these two things together, you create success. Often success in an endeavor(努力) leads to more interest and a greater desire to learn, creating an upward spiral(螺旋形) of motivation toward a goal you have established.

So be honest with yourself. Are you genuinely interested in being in college? Have you set realistic goals for yourself? How can you develop the internal motivation that really counts? When it comes to motivation, KNOWING is not as important as DOING.

小题1:Why does the writer give the example of a car in the second paragraph?

A.Because people can never go far without a good car.

B.Because a good car motivates some college students to study harder.

C.Because a good car is a symbol of being a success.

D.Because motivation leads people to success like it starts a car.小题2: What is the CORRECT comparison between the internal motivation and the external (外部的)motivation?

A.Only the internal motivation can result in success.

B.Internal motivation is more important than external motivation.

C.Internal motivation and external motivation has equal importance.

D.External motivation is enough for people to achieve success.小题3: According to the article the following factors can push people towards their goals EXCEPT __________?

A.interest

B.the desire to learn

C.the knowledge of motivation

D.the sense of success小题4: What’s the main purpose of the article?

A.To encourage everyone to develop motivation for whatever they are doing..

B.To inspire college students to set goals for their college life.

C.To imply that the less motivated college students quit the college.

D.To call on parents to give up their over-protection of their children.小题5: What may be the writer’s advice to the potential readers?

A.The goals you set for yourself shouldn’t be far beyond your reach.

B.You needn’t attend college if you are really not interested in it.

C.You should work harder to win praise from others.

D.Honesty is the best policy to solve problems in your life.

单项选择题