只有了解()才能在细分市场中把握企业的目标市场，正确预测市场需求。A、消费层次与消费

动作电位的特点（）

A.刺激强度小于阈值时，出现低幅度动作电位

B.刺激强度达到阈值后，再增加刺激强度动作电位幅度增大

C.动作电位一经产生，便可沿细胞膜作电紧张性扩布

D.各种可兴奋细胞动作电位的幅度和持续时间可以各不相同

E.刺激强度越大，动作电位扩布速度越快

完形填空（共20小题，每小题1.5分，满分30分）

阅读下面短文，掌握大意，然后从各小题所给的A、B、C、D四个选项中选出最佳选项

When I was a girl, in the deserts of Somalia(索马里), my family was nomadic(游牧的),   36 with our animals, and leading a happy life.

I was about thirteen  37 my father called me at the end of a hot day. “Come and  38  here.” He said．“I’ve found you a  39 ! We have arranged that he will  40  me five camels. “ That night I ran away. I was  41．For almost three weeks, I walked  42 the desert, and finally I got to my auntie’s house in Mogadishu. Auntie’s husband was an ambassador（大使）, and in a few months I  43 Britain to work at his London house.

One day a  44  called Michael Goss saw me in the street. He took my picture and the photographs were  45 . “You should try and do  46 ,” he told me. When my aunt and uncle  47 Africa, I stayed in London. I found a place to stay and got  48  at McDonald’s before I  took Michael Goss’s photographs to an agency one day. They  49  me to a studio, and my picture appeared  50 of the Pirelli calendar. Soon after that, the agency got me  51  in the James Bond film The Living Daylights.

That was seven years ago. Since then I’ve done modeling all over the world and I’ve had frequent 52  in magazines such as Vogue and Elle. I have  53  hosted the US music program Soul Train.

Once  54 five camels, now I can  55  up to ₤5000 for one day’s work. I have gone from the bottom to the top.

36．A．working hard     B．living together     C．looking after        D．moving around

37．A．when            B．after              C．as                 D．before

38．A．listen            B．sit                 C．work             D．see

39．A．business          B．boss              C．husband            D．chance

40．A．support           B．provide            C．share             D．give

41．A．excited           B．worried            C．frightened         D．surprised

42．A．around           B．through            C．inside            D．beyond

43．A．flew to           B．stayed in           C．chose            D．left

44．A．director          B．editor            C．photographer       D．writer

45．A．satisfied          B．beautiful           C．well-mannered     D．young

46．A．designing        B．photographing      C．dressing            D．modeling

47．A．moved to        B．changed for         C．returned to       D．started for

48．A．something to eat  B．a job              C．a bedroom        D．a workroom

49．A．sent             B．wanted             C．ordered            D．informed

50．A．in the list        B．on the cover         C．in the ads          D．on the page

51．A．a rise            B．a job             C．a part            D．an actress

52．A．interviews       B．performances       C．visits             D．appearances

53．A．already           B．even              C．yet                D．still

54．A．looking after      B．feeding             C．worth            D．as much as

55．A．pay             B．spend            C．give                 D．earn

以下是急性心肌梗死并发症，不包括

A． * * 肌功能失调或断裂

B．心脏破裂

C．心室壁瘤

D．梗死后心绞痛

E．心肌梗死后综合征

如图，马路上，一辆汽车超速行驶，执勤交警立即发现了异常，果断地拦下该车．

（1）该车进入交警的视线，在交警的眼球内成像的顺序是：______（按正确顺序填写下列结构的序号）①玻璃体  ②晶状体  ③角膜  ④视网膜  ⑤瞳孔

（2）司机看见交警靠边停车的手势后，减速后靠边停车，这属于______反射．

（3）交警要求司机对着酒精测试仪吹气，司机吹气时膈肌的状态应该是______．（填“收缩”或“舒张”）

（4）从酒精测试情况看，交警怀疑司机是醉酒驾驶，因而要求司机抽血检验，医生从司机前臂的一条“青筋”抽取了血液，该“青筋”属于______血管．

（5）因为醉酒，司机开车时动作不协调，主要原因是酒精麻痹了______．

构造变动