下述哪项是卵巢肿瘤常见的并发症A．蒂扭转B．囊肿破裂C．感染D．恶变E．破裂后腹膜炎

在破伤风手术后，空气消毒采用：（）

A.乳酸消毒法

B.紫外线消毒法

C.40%甲醛消毒法

D.10%甲醛消毒法

E.0.1%次氯酸钠消毒法

阅读理解。

     Millions of aircraft take off around the world every year.  The skies they fly in seem limitless-miles of

empty space.  But,with the number of flights increasing each year,this emptiness no longer exists.  

Researchers in the world of aviation(航空) are worried about the increasing pressure on pilots and

ground controllers.  And increasing collisions ,occurring at or near an airport,have called attention to the

need for more aids(辅助设备) to aviation control.

      People who travel the skies are not certain about air safety. A great deal of money is spent on new

and bigger aircraft and airports to deal with the vast increase in passengers travelling by air.  Only a small

percentage of this money is spent on navigation(导航) and other aids.  Actually,suitable electronic

equipment has long existed,and many companies market safety aids designed to make it safer for aircraft

to take off,fly any distance,and land,whatever the weather.

Yet,there are two problems to be solved. The first is to get govemments,airlines and airport officials to

agree to basic levels of safety aids.  The second problem is to find a way of meeting these basic

requirements.

      But no matter how well the equipment works,operators of the equipment still play an important role. 

 Communications between pilots and ground controllers are extremely important to air safety. It is worth

pointing out that the mishearing or misunderstanding of instructions in English and the use of another

language,in an intemational conversation,has led to two recent aircraft accidents.  A new type of

instrument(仪器) called FLIGHTWATCH would help pilots prevent airport collisions. It would be

particularly helpful near airports.  

1. The increasing number of flights leads to the fact that______.       

A. flying is no longer limited in the sky

B. there is no empty space for aids to aviation control

C. piloting and controlling planes is getting more difficult

D. the pressure on the ground becomes greater    

2. There is uncertainty about air safety because  _____.      

A. planes become bigger for the increasing number of passengers

B. money spent on electronic equipment is far from enough

C. suitable electronic equipment hasn't been invented yet

D.  it is dangerous for planes to take off or land 

3. The underlined word "collisions" probably means _________.       

A. accidents in which two planes hit each other

B. misunderstandings between pilots and ground controllers

C. quarrels among passengers

D.  breakdowns of new types of instrument

下面叙述是否正确，试评析：

我国《票据法》上不存在空白背书。

关于社区卫生服务的概念，正确的是

A．它是社区服务中一种最基本的、便宜的服务形式

B．在人类社会发展的不同阶段，它有不同的内容、方法和制度

C．它以三级卫生机构为主体

D．它以需要为导向，提供无偿服务

E．它以解决慢性病和常见病为主要目标