链霉素主要不良反应为 A．末梢神经炎 B．高尿酸血症 C．过敏反应 D．听力障碍 E

患者男，49岁，主因“胸闷1h”入院。患者于入院1h前无明显诱因突然出现胸闷，心前区压榨感，呈持续性进行性加重，伴全身冷汗，双上肢极度酸软不适，偶有心悸，无胸痛，无呼吸困难。门诊行心电图检查后以“冠状动脉性心脏病，急性下壁心肌梗死”收入院。平素体健，否认高血压、糖尿病等病史。查体：T36.7℃，R16次/min，P66次/min，BP146/92mmHg；意识清醒，痛苦面容，疲乏；颈静脉无怒张，双肺呼吸音稍粗，无干、湿性啰音；HR66次/min，律齐，各瓣膜听诊区未闻病理性杂音；腹部未见特殊；双下肢无水肿。

患者经抢救后，大动脉搏动可及，面色转红，自主呼吸恢复。分析其此次心搏骤停的原因可能为（）。

A.低血容量

B.酸中毒

C.冠状动脉血栓

D.低体温

E.心脏压塞

下列溶液中Cl^-浓度与50mL 1mol•L^-1 AlCl₃溶液中Cl^-的物质的量浓度不相等的是（　　）

A．150mL 1mol•L^-1的NaCl溶液

B．75mL 3mol•L^-1NH₄Cl溶液

C．150mL 3mol•L^-1的KCl溶液

D．75mL 1mol•L^-1的FeCl₃溶液

________ a mobile phone can you ring ______ you want to talk with anyway.

A．Using; whoever

B．Only on; whomever

C．By; whatever

D．With; anyone

文件的逻辑块号到物理块号的变换是由下列( )决定的。

A．逻辑结构

B．物理结构

C．目录结构

D．调度算法

     Certainly no creature in the sea is stranger than the common sea cucumber (海参). All living

creatures, especially human beings, have their features, but everything about the little sea cucumber

seems unusual. What else can be said about an unusual animal that eats mud, feeds almost continuously

day andnight but can live without eating for long periods, and can be poisonous but is considered

eatable?

     For some fifty million years in spite of all its strange features, the sea cucumber has lived on its diet of

mud. It is adaptable enough to live attached to rocks by its tube feet, under rocks in shallow Water, or

on the surface of mud flats. Common in cool water on both Atlantic and Pacific shores, it has the ability

to suck up mud or sand and digest whatever nutrients are present.

     Sea cucumbers come in a variety of colors, black to reddish-brown to sand-color and nearly white.

One form even has vivid purple feelers. Usually the creature are cucumber-shaped — where their name

comes from - and because they live in rocks, this shape, combined with flexibility, enables them to press

into crevices (缝隙) where they are safe from animal eater and ocean currents.

     Although they have greedy desire for food, eating day and night, sea cucumbers have the ability to

become still and live at a low metabolic (新陈代谢) rate — feeding s little or not at all for long periods,

so that the living things in the ocean that provide their food have chance to increase by a large amount.  

If it were not for this natural ability, they would swallow all the food available in a short time and would

probably starve themselves out of existence.

     But the most impressive thing about the sea cucumber is the way it defends itself. Its major enemies

are fish and crabs. When attacked, it forces all its organs in its body out into water. It also removes

attached structures such as feelers. The sea cucumber will get rid of its organs and grow itself again if it

is attacked or even touched; it will do the same if the surrounding water temperature is too high or if the

water becomes too polluted.

1. According to the passage, why is the shape of sea cucumbers important?

A. It makes them attractive to fish.

B. It helps them to digest their food.

C. it helps them to protect themselves from danger.

D. it makes it easier for them to move through the mud.

2. The fourth paragraph of the passage mainly discusses ______.

A. the reproduction of sea cucumbers  

B. the food sources of sea cucumbers

C. the eating habits of sea cucumbers    

D. the danger to sea cucumbers' existence

3. What can he inferred about the defense system of the sea cucumber?

A. They are similar to those of most sea creatures,

B. They are very sensitive to the surroundings.

C. They require group cooperation.

D. They are almost useless.

4. What would be the best tithe for the text?  

A. The Variety of Sea Cucumbers      

B. The Sources of Sea Cucumbers

C. The Similarity of Sea

D. The Strange Creature — Sea Cucumbers