由于制造时骨架的边缘或转角处毛刺产生的裂纹。若不影响铆钉，螺栓边距和构件强度，可止裂

如右图所示，高为h的光滑绝缘曲面处于匀强电场中，匀强电场的方向平行于竖直平面，一带电荷量为+q，质量为m的小球，以初速度为v₀从曲面底端的A点开始沿曲面表面上滑，到达曲面顶端B点的速度仍为v₀，则  （    ）

A．电场力对小球做功为

B．A、B两点的电势差为

C．小球在B点的电势能大于在A点的电势能

D．电场强度的最小值为

提出烧灼断脐法预防初生儿脐风的医学著作是

A．《幼幼新书》

B．《全幼心鉴》

C．《婴童百问》

D．《保婴撮要》

E．《小儿卫生总微论方》

第二节：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

As the drought（干旱） continued to seem to be endless, a small community of mid-west farmers were wondering what to do next. The rain was important not only to keep their crops     36    , but to support the townspeople's way of     37    . Since the problem needed immediate    38    , the local church felt it was time to call a prayer meeting to ask for    39   .

In what seemed an unclear remembrance（纪念） of a Native American   40    , the people began to arrive. After they were all    41    , the pastor（牧师）on his arrival watched as the townspeople continued to arrive. He slowly    42     his way to the front to officially    43    the meeting.

Everyone was taking the opportunity to     44    with close friends. When the pastor     45     the front, his thoughts were on quieting those     46     and starting the meeting.

47    he began to ask for quiet, his eyes    48     through the crowd and he took     49     of an eleven year-old girl sitting in the front row.

Her face was shining     50     excitement and she     51     sat in her place. Next to her, was a bright red umbrella,    52     for use. The beauty and innocence（纯真） of the girl made the pastor smile as he     53     the faith she had. No one     54     at the meeting had brought a/an     55    .

They had all come to pray for rain, but she had come expecting God to answer with the needed rain.       

36.A. wealthy     B. healthy          C. powerful      D. necessary

37.A. work        B. entertainment     C. stay          D. life

38.A. attention          B. solution         C. fiction        D. conservation

39.A. rain          B. help           C. money             D. advice

41.A. covered     B. crowded        C. occupied      D. seated

42.A. found       B. struggled       C. felt           D. made

43.A. end              B. close          C. begin        D. hold

44.A. talk              B. tell            C. say           D. drink

45.A. arrived     B. reached         C. got           D. hurried

46.A. possible     B. patient              C. pure          D. present

47.A. As         B. Until          C. Though        D. Unless

48.A. got         B. went          C. looked             D. saw

49.A. hold         B. sight          C. notice        D. glance

50.A. for         B. with           C. by            D. at

51.A. quietly     B. calmly              C. anxiously     D. worriedly

52.A. eager        B. ready         C. curious         D. awful

53.A. recognized    B. promised       C. realized        D. allowed

54.A. even         B. else            C. still          D. also

55.A. apron       B. raincoat         C. record        D. umbrella

6分钟步行实验中正确的是（）

A.<150m为重度心功能不全

B.200～400m为中度心功能不全

C.100～300m为中度心功能不全

D.<200m为重度心功能不全

E.200～400m为轻度心功能不全

患者男性，38岁，上腹部持续饱胀不适感半年，餐后症状加重，但食欲及体重无明显变化。出现黑便3天，每日1次，大便成形有光泽。查体：上腹部轻压痛，肝脾肋下未触及，无明显贫血面容，幽门螺旋杆菌检测阳性。

为进一步明确诊断，首选的检查是

A．急诊X线钡餐检查

B．待大便变黄后做x线检查

C．有黑便期间做急诊胃镜检查

D．待大便变黄后胃镜检查

E．择期做X线气一钡双重造影