问题 单项选择题

心尖区闻及隆隆样舒张期杂音,考虑为( )。

A.二尖瓣关闭不全

B.主动脉瓣关闭不全

C.二尖瓣狭窄

D.肺动脉瓣狭窄

E.三尖瓣狭窄

答案

参考答案:C

解析: 心脏体征:①心尖区第一心音亢进和开瓣音,如前叶钙化僵硬,则第一心音减弱和 (或)开瓣音消失。②心尖区有低调的隆隆样舒张中晚期杂音,常伴舒张期震颤;窦性心律时,由于舒张晚期心房收缩促使血流加速,杂音于此时加强;房颤时,舒张晚期杂音消失。

阅读理解

The octopus’s(章鱼)reputation as a human-killer isn’t simply an exaggeration(夸张)—it is a total myth. The octopus can indeed be a deadly hunter, but only of its natural victims. Some shellfish(壳类动物)and an occasional sick or incautious fish have reason to be frightened of this multi-armed hunter, but a person is much too large to interest even the biggest octopus. Even the largest among octopi is much smaller than most people imagine. Far from being large enough to swallow a ship, as monster octopi in movies have been known to do, the largest octopus, found on the Pacific coast, weighs around 110 pounds and grows to no more than ten feet in width.

The hard, parrot-like beak(喙)of an octopus is not used for attacking deep-sea divers, but for cutting open shellfish. Indeed, the octopus possesses such a tiny throat that it cannot swallow large pieces of meat. Instead, it feeds by pouring digestive juices into its victims, and then sucking up the soupy remains. A shellfish that finds itself in the grasp of an octopus has only a short time to live. But human beings are perfectly safe. Still, people rarely care to go close enough to these careful creatures to get a good look at them.

小题1:This passage is mainly about          .

A.the horrors of the octopus

B.the largest octopus in the world

C.octopi and their behavior

D.the octopus’s deadly hunting method小题2:It is implied but not stated in the passage that          .

A.people have unreasonable fears about the octopus

B.the octopus is not interested in human beings

C.the octopus is afraid of human beings

D.the octopus is a very cruel sea animal小题3:What does the underlined part “careful creatures” refer to in the last paragraph?

A.Octopi.

B.Shellfish.

C.Fish.

D.The victims.小题4:The hard beak of the octopus is used for          .

A.attacking deep-sea divers

B.cutting up large pieces of meat

C.cutting open its victims

D.defending itself小题5:From the passage, we can conclude that          .

A.the octopus is not dangerous to man

B.people often fear creatures that are not dangerous to them

C.the octopus only hunts its natural victims

D.things described in movies are not to be believed

单项选择题