在交流电压放大 电路中，产生非线性失真的原因有哪些？静态值对失真有何影响？

第两节完型填空一 （共12小题，每小题1.5分，满分18分）

阅读下面短文，掌握其大意，然后从36—55各题所给的（A、B、C、D）四个选项中，选出最佳选项，并在答题卡上将该项涂黑。

Last Tuesday I took two daughters, aged five and seven, to town by car. It began to rain _36_ so I decided I would leave the children in the car _37_ I rushed into a shop. I warned the girls not to _38_ anything and told them I would be back within a few minutes. Then I locked all the doors and left _39_ happily out of the window.

I returned to the car in less than five minutes but the girls had _40_ ! I could hardly believe my eyes . The car doors were _41_ locked, the windows tightly shut and on the back seat were only two coats. Being _42_, I ran to the corner of the street _43_ there was no sign of them. I rushed up to an old lady nearby and asked _44_ she had seen two small girls but she said “No”.

Feeling quite sick with fear, I sat on the driver’s seat, and went to stop trembling (发抖). Suddenly, I heard  a merry laugh _45_ me. I got out of the car, ran round to open the boot (车尾行李箱) and inside were two very red-faced and _46_ children. They had obviously pulled out the back seat, climbed behind it and then been unable to push the seat forward again. _47_ tears in my eyes, I leaned forward and pulled their ears.

36.A.heavy  B. hard        C. big            D. quick

37.A.before            B. since          C. after           D. while

38.A.talk              B. reach         C. hear            D. touch

39.A.them             B. her           C. herself          D. themselves

40.A.discovered         B. disappeared    C. described       D. delivered

41.A.even               B. again         C. already         D. still

42.A.foolish            B. proud         C. frightened       D. pleased

43.A.where            B. which        C. that            D. when

44.A.what             B. when         C. whether         D. how

45.A.behind            B. over                C. before          D. with

46.A.worried           B. excited              C. surprised        D. interested

47.A.For        B. About               C. With           D. Down

下述脑脂质沉积病是指下列哪种病变()

A．进行性多灶性白质脑病

B．Cockayne综合征

C．同心圆型硬化

D．视神经脊髓炎

E．异染性脑白质营养不良

下列哪些行为应处以人民币1万元以上5万元以下的罚款（）。

A.非法转让或变相转让许可证

B.未经旅游行政管理部门审核批准，擅自设立分支机构的旅行社

C.未经旅游行政管理部门审核批准，经营旅游业务的

D.外国旅行社常驻机构超范围经营旅游业务的

亡阴之汗的特点是

A、汗热而黏如油

B、汗热味淡不黏

C、汗冷味淡不黏

D、汗冷味淡而黏

E、以上都不是

对边长分别为a和b的矩形野，等效方野的计算公式是（）

A.ab/（a+b）

B.2ab/（a+b）

C.ab/2（a+b）

D.（a+b）/ab

E.2（a+b）/ab