设q1和q2是指向一个float型一维数组的指针变量，k为float型变量，则不能正

住宿经营者在提供住宿服务中，应当履行以下义务（）。

A.保障旅客人身财产安全

B.不加歧视地接待所有旅客

C.依法处理旅客遗留的物品

D.向旅客收取合理费用

患儿女，7岁。右下第一恒磨牙窝洞着色且能卡住探针，疑有龋坏，医生为该儿童选择的防治措施是（）。

A.窝沟封闭

B.预防性充填

C.局部用氟

D.ART

E.充填治疗

评估输精管结扎有效率的科学指标是（）

A．精液两次离心沉淀中精子消失率

B．精液直接涂片精子消失率

C．活动精子消失率

D．不活动精子

E．女方未妊娠

Why would an animal kill itself? It seems a strange question, and yet it is one that has made some scientists curious for a long time. For there is a kind of animal called lemming（旅鼠）, that periodically killed themselves together, and no one knows just why!

The small creatures which live in the Scandinavian mountains, feed on a diet of roots and special insects and live in nests they dig underground. When their food supply is large, the lemmings live a normal and undisturbed life. 

However, when the lemmings’ food supply becomes too low to support the population, a singular migration（迁徙）begins. The lemmings leave their nests in groups. Great numbers of them begin to travel across the Scandinavian plains, a journey that may last weeks. The lemmings eat everything in their path, continuing their long march until they reach the sea. 

The reason for what follows remains unbelievable to naturalists. Upon reaching the coast, the lemmings do not stop but swim by the thousands into the sea. Most stay afloat only a short time before they tire, sink and drown. 

A common theory for this mass self-killing is that the lemmings do not realize that the ocean is such a huge body of water in their cross-country journey, the animals must cross many smaller bodies of water, such as rivers and small lakes. They may think that the sea is just another such swimmable path to go through. But no final answer has been found to the strange happening. 

小题1:The passage is mainly about______. 

A．how lemmings find food

B．why animals kill themselves

C．the lemmings’ self-killing

D．the food supply in the Scandinavian mountains小题2:A reason for the lemmings’ self-killing might be that they______. 

A．go mad from a lack of food

B．hope to find fish for food

C．decide to reduce the population

D．think they can cross the sea小题3:Why are scientists curious about the lemmings’ behavior?

A．Because they are the only animals that live in Scandinavia.

B．Because it is very unusual for animals to kill themselves.

C．Because of the amount of food they can eat on their march to the sea.

D．Because they can gather together in such huge numbers.小题4:The underlined word “singular” means______.

A．unusual

B．single

C．wonderful

D．common

关于甲状腺 * * 状癌，下列叙述不正确的是（）

A.为甲状腺癌最常见的类型

B.青少年女性多见

C.本癌发现时约50％已有颈淋巴结转移，因此预后很差

D.生长较慢，恶性程度较低

E.有时原发灶很小，临床上首先发现转移病灶