关于外毒素的叙述，哪项错误（）。A.化学成分是蛋白质 B.毒性作用强，对组织有选择性

以下哪些电路工作状态是正常的？（）。

A.ACT

B.STBY

C.OOS

D.OOSF

患儿男，6岁。因发热6天，皮疹1天就诊，病后伴咽痛、纳差、乏力。院外应用多种抗生素治疗效果不佳。查体：T39.7℃，P128次／分，呼吸25次／分，BP108／75mmHg，精神差，咽峡部红肿，扁桃体充血肿大，双侧颌下和颈部可触及数个花生米大小淋巴结，活动，无粘连和压痛，躯干部皮肤可见散在红色斑丘疹，肝肋下3cm，脾肋下1cm。

传染性单核细胞增多症有可能出现的合并症是（）

A.自身免疫性溶血性贫血

B.脑炎

C.肺炎、胸膜炎

D.胃穿孔

E.肾结石

F.角膜溃疡

意杨树是生活中常见的木本植物，其茎从外到内的结构依次是

A．树皮→形成层→木质部→髓

B．树皮→木质部→形成层→髓

C．树皮→形成层→髓→木质部

D．树皮→木质部→髓

下列历史人物出席了1921年7月在上海(最后一天改在浙江嘉兴南湖)秘密召开的会议，参加会议的共13人。这次会议的召开

A．使中国从此有了代表整个中 * * 利益的新型的无产阶级革命政党

B．确定了开展土地革命和武装反抗国民党反动派的总方针

C．结束了“左”倾冒险主义在党中央的统治，是中共历史上生死攸关的转折点

D．使中 * * 党在毛 * * 思想的旗帜下实现了空前的团结

A person may have an idea about himself that will prevent him from doing good work.

He may have the belief that he is not capable (有能力的) of it. A child may think he is __1__ because he doesn’t understand how to make the __2__ of his mental faculties (才能). Older people may be mistaken that they are incapable of learning things new because of their __ 3__.

A person who believe that he is incapable will not make a real __4__ because he feels that it would be useless. He won’t go at a job with confidence necessary for __5__ , and he won’t  work his hardest way, even though he may think he is doing so. He is __6__ likely to fail, and the failure will __7__ his belief in his competence (才能) .

Alfred Alder, a famous doctor, had __8__ like this. When he was a small boy, he had a poor __9__ in maths. His teacher told his parents he had no ability in maths in order that they would not __10__ too much of him. In this way, they two __11__ the idea. He accepted __12__ mistaken thinking of his ability, felt that it was useless to __13__ and was very poor at maths, __14__ as they expected.

One day he worked at a problem which __15__ of the other students had been able to solve.

Alder __16__ in solving the problem. This gave him confidence (信心). He now __17__ with interest, determination and purpose, and he soon became especially good at __18__. He not only proved that he could learn maths well, but luckily he learned __19__ in his life from his own experience that if a person goes at a job with determination and purpose, he may __20__ himself as well as others by his ability.

1. A. clever                   B. shy                   C. useless                     D. stupid

2. A. biggest                 B. most                 C. highest                     D. deepest

3. A. ability                  B. age                   C. brain                        D. knowledge

4. A. decision                B. success              C. effort                       D. trouble

5. A. work                    B. study                C. improvement            D. success

6. A. truly                       B. really                C. however                   D. therefore

7. A. lead to                 B. strengthen         C. increase                    D. add to

8. A. an experience        B. an example        C. a thought                  D. a story

9. A. state                        B. mind                 C. start                         D. ending

10. A. blame                 B. expect               C. get                           D. win

11. A. developed           B. organized          C. discovered                D. found

12. A. his                     B. her                   C. its                          D. their

13. A. manage               B. succeed             C. try                         D. act

14. A. only                   B. almost               C. just                        D. then

15. A. none                   B. no                    C. no one                   D. nobody

16. A. gave                   B. succeeded          C. failed                            D. believed

17. A. lived                  B. worked             C. played                    D. graduated

18. A. lessons                  B. medicine           C. subjects                  D. maths

19. A. early                  B. deeply               C. late                        D. simply

20. A. encourage           B. love                  C. astonish                  D. disappoint