人体感染寄生虫后，既没有临床表现，又不易用常规方法检获病原体的一种寄生现象属于 A．

引起根分叉病变的主要原因是（）

A.存在釉珠，无牙周膜附着

B.创伤

C.菌斑

D.磨牙髓室底常有侧副根管存在

E.以上均是

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。

It was Thanksgiving morning. In the crowded kitchen of my small home I was busy preparing the traditional Thanksgiving turkey   36   the doorbell rang. I opened the front door and saw two small children in rags huddling together inside the storm door on the top step.

“Any old   37   , lady?” asked one of them

I was   38   . I wanted to say “no” until I looked down at their feet. They were wearing thin scandals(便鞋), wet with heavy snow.

“Come in and I’ll   39  you a cup of hot cocoa.”

There was no conversation. Their wet scandals  40  marks upon the floor. I   41   them cocoa and bread with jam to fight against the cold outside. Then I went back to the   42  and started again on my household budget.

The silence in the front room struck through to me. I   43   in. The girl held the empty cup in her hands, looking at it. The boy asked   44   a flat voice, “Lady, are you rich?”

“Am I rich? Mercy, no!”

I looked at my shabby(寒酸的) slipcovers. The girl put her   45   back in its saucer(茶碟) carefully and said.

“Your cups match your saucers.”

Her   46   was hungry with a need that no amount of food could supply. They left then, holding their bundles of papers against the wind. They hadn’t said “Thank you”. They didn’t   47  to. They had done   48 that. Plain blue pottery cups and saucers were only worth five pence.   49   they matched.

I   50   the potatoes and stirred the meat soup. Potatoes and brown meat soup, a roof over our heads, my man with a good steady job—these things  51 , too.

I moved the chairs back from the fire and cleaned the living room. The muddy prints of small scandals were still   52   upon my floor. Let   53  be for a while. I want them there   54   I forget again how   55   I am.

36.A. while     B. as        C. when                D. until

37.A. clothes       B. books      C. shoes                D. papers

38.A. busy      B. confused  C. impatient                  D. free

39.A. cook      B. make       C. do                  D. give

40.A. left        B. kept           C. held                      D. wiped

41.A. sent       B. took           C. served               D. showed

42.A. study     B. bedroom  C. living room             D. kitchen

43.A. turned        B. gave        C. looked              D. checked

44.A. at         B. in       C. with                 D. to

45A. food       B. spoon     C. toast                 D. cup

46.A. voice       B. coat      C. story                 D. memory

47.A. expect     B. know     C. need                  D. mean

48.A. less than          B. more than  C. rather than           D. other than

49.A. And       B. So       C. Then                  D. But

50.A. tasted       B. peel      C. washed             D. cut

51.A. separated    B. matched  C. were the same         D. were different

52.A. strange     B. new     C. deep                D. wet

53.A. it         B. them    C. that                    D. one

54.A. in case      B. as if     C. although             D. in order that

55.A. happy       B. lucky   C. rich                D. moved

男，78岁，呕吐，腹胀21小时，无明显腹痛，既往有消化道溃疡病史，上腹部压痛，腹肌紧张，血压80/50mmHg，脉搏108次／分，血淀粉酶250U，血钙1.7mmol/L。

治疗不合适的是（）

A.禁食

B.胃肠减压

C.及早使用奥曲肽或施他宁

D.应用肾上腺皮质激素

E.静脉补钙有决定性意义

全血细胞减少、骨髓增生低下、造血细胞减少，这样的血象骨髓象不见于（）

A.再障

B.低增生性白血病

C.溶血性贫血

D.PNH

E.骨髓纤维化

在腹部，前正中线旁开0.5寸的经脉是（）

A.足太阳膀胱经

B.足少阴肾经

C.足阳明胃经

D.足太阴脾经

E.足厥阴肝经