[2013·湖南娄底5月]平面α∥平面β，点A，C∈α，B，D∈β，则直线AC∥

革兰阳性菌与革兰阴性菌的细胞壁肽聚糖结构主要区别在于（）

A.聚糖骨架

B.四肽侧链

C.五肽交联桥

D.β-1，4糖苷键

E.N-乙酰葡糖胺与N-乙酰胞壁酸

女性，56岁。间断上腹部隐痛或不适10余天。去年发生过脑梗死，左侧偏瘫，1周前服用阿司匹林，左上腹部疼痛加重，昨天黑便两次。（）

A.食管静脉曲张破裂出血

B.急性胃炎出血

C.反流性食管炎出血

D.食管贲门黏膜撕裂综合征

E.消化性溃疡出血

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

People living in the country enjoy several advantages that people living in the city cannot enjoy.

___小题1:______They make friends with trees and stones. They breathe fresh air. They fight with strong winds. __小题2:______.

This contact with nature is good for health. There are many diseases that are common in the city, but are not to be found in the country, For example, near-sightedness is almost unknown to country people.

Because of the absence of cars, one can walk more freely in the country than in the city, ___小题3:_____

People living in the country can easily get fresh vegetables, fresh fruit and fresh milk, and they get them at lower prices than in the city.

____小题4:____There are practically no temptations to waste money.

_____小题5:____ They say what they mean, and make and keep promises with sincerity (诚意). They do not put on air (摆架子). They do not pretend to have those ridiculous manners which are necessary in what we call polite society.

A．They listen to the song of birds.

B．Country people are mostly honest.

C．They are in close contact with nature.

D．Country people are far from town life.E. Country life is economical (节俭的) in other ways, too.

F. Country life provides much more enjoyment.

G. There are no rules of the road nor traffic signs to obey.

(答题处)  71.       72.      73.      74.      75.       

患者男性，64岁，因“左前臂痛3个月”来诊。患者近6个月来疲劳感明显，时常感觉全身不适，常有腰痛。左前臂X线片：尺骨近端卵圆形溶骨性病灶。针吸细胞学报告：可见浆细胞。

该病此阶段无手术指征的证据包括（）

A.多发病灶

B.系统性病变

C.已确诊

D.已外固定

E.已使用支具

F.化学治疗效果良好

土坝的设计必须达到那些要求？