问题 单项选择题 案例分析题

患者男,34岁,因“劳力性心悸、气促5年”来诊。患者从未接受过治疗。查体:心尖搏动增强,左下移位,心尖可闻及全收缩期和舒张期隆隆样杂音,肺动脉瓣听诊区第二心音亢进,双下肢轻度水肿。

下一步应该采取的措施是().(提示患者血培养结果为金黄色葡萄球菌生长,泰能和万古霉素抗感染治疗7d后,体温38.5~40.0℃,左侧肢体不能活动,BP85/40mmHg,血红蛋白尿。超声:二尖瓣赘生物由5mm增至12mm。颅脑MRI:2个直径1.5cm的梗死灶。)

A.尽快手术

B.更换抗生素

C.血培养阴性后手术

D.尿常规正常后手术

E.肺部感染控制后手术

F.偏瘫症状改善后手术

答案

参考答案:A

单项选择题
阅读理解

阅读理解。

     Animals can move from place to place, but plants cannot. When an animal is under attack, it can run away

or fight back.. Plants certainly cannot run away, and they lack teeth and claws. But plants can defend

themselves by using both physical and chemical means.

     Some plants have their own ways to keep animals away. For example, the leaves of the holly plant have

sharp spines (刺) that discourage grass-eating animals. Holly leaves on lower branches have more spines than

leaves on upper branches. This is because the lower leaves are easier for most animals to reach.

     Some plants, such as the oak tree, have thick and hard leaves that are difficult for animals to eat. Some

grasses may contain a sandy material; eating such grasses wears down the animal's teeth. 

     Many plants also have chemical defenses. Some plants produce chemicals that taste bitter or cause an

unpleasant reaction. Some plants may fight against an attack by increasing the production of these chemicals.

When a caterpillar (毛虫) bites a tobacco leaf, the leaf produces a chemical messenger. This messenger sends

to the roots the information to produce more nicotine. The higher levels of nicotine discourage the caterpillar.

     Many plants depend on both physical and chemical defenses. A certain plant in China, for instance, has

prickly (多刺的) leaves, and each prickle contains poisonous venom (毒液) A single experience with this kind

of plant will teach an animal to stay away from it in the future.

1. The holly plant has more spines on the lower leaves because most animals ______.

A. are not tall enough

B. like the lower leaves only

C. are not clever enough

D. can get the lower leaves easily

2. To defend themselves, oak trees use ______.

A. chemical means

B. physical means

C. bitter chemicals

D. sandy materials

3. How does tobacco protect itself against an attack from a caterpillar?

A. Its leaves fight against the attack by physical means.

B. Its roots send a messenger to discourage the caterpillar.

C. Its roots increase the production of nicotine when it is attacked.

D. Its leaves produce poisonous sand to drive the caterpillar away.

4. What would be the best title for this passage?

A. Plants and Animals

B. How Plants Defend Themselves

C. Attacks and Defenses

D. How Animals Eat Plant Leaves