下列地理条件中有利于聚落形成的是 A．地形崎岖，资源贫乏 　 B．交通闭塞，通风

高速机械的（）是可能引起振动的主要部件。

A、支架

B、轴承

C、转子

D、B和C

British researchers are looking for volunteers willing to eat a piece of chocolate daily for a year in the name of science. The trial(实验) will explore whether flavonoids (类黄酮) found in chocolate and other foods can reduce the risk of heart disease.

“We are looking at a high risk group first,” said Aedin Cassidy, a biochemist who will lead the study.

Previous studies have suggested dark chocolate is rich in the beneficial flavonoids linked with heart health, but experts note the high sugar and fat content of most commercially available chocolate might cancel out some of the advantages. Other research has also shown dark chocolate appears to lower blood pressure, improve the function of blood vessels (血管)and reduce the risk of heart attack.

This has encouraged companies to market specific products containing dark chocolate. Mars Inc has introduced Cocoa Via, a line of dark and premium chocolates that plays up such health advantages.

Cassidy said her team will also publish findings in the American Journal of Clinical Nutrition showing that flavonoids found in soy and cocoa appear to have the strongest effects of reducing risk of heart disease.

The next step will organize 150 women volunteers with a specific illness. The researchers will look at whether flavonoids help reduce blood pressure, cut cholesterol levels and improve the condition of blood vessels.

Half the women in the year-long study will eat chocolate containing 30 grams of flavonoids found in soy, cocoa and other fruits and vegetables. The others will get chocolate without the active flavonoids.

“This could help doctors give advice to patients on the type and amount of foods to eat to reduce heart disease risk—and it does not necessarily need to be chocolate,” Cassidy said. “If this trial works we will be able to advise on a whole range of foods. People won't have to go around eating specially designed chocolate.”

1. What is the best title for the passage?

A. Volunteers wanted for chocolate study.           B. Chocolate is good for health.

C. A new research on heart attacks.                 D. Flavonoids found in chocolate.

2. What’s the purpose of the trial?

A. To test the advantages of a new kind of chocolate.

B. To find cures for heart disease.

C. To discover how to control blood pressure.

D. To explore the advantages of flavonoids.

3. From Paragraph 3 we can infer that __________.

A. Cassidy’s team has done several studies on chocolate

B. dark chocolate has proved beneficial to health

C. people should eat much chocolate with high sugar and fat

D. most commercially available chocolate doesn’t contain flavonoids

4. Which of the following statements is TRUE according to the passage?

A. All the volunteers will eat the same chocolate.

B. CocoaVia is a company that produces dark chocolate.

C. People who want to take part in the trial should be healthy.

D. Soy, cocoa, some fruit and vegetables contain flavonoids.

当人体肾脏功能衰竭而不能正常工作时，体内的废物就不能排出，人就会因中毒而死亡。下图是利用人工肾脏对人体进行血液透析的过程。

请回答：

(1)处理后的血液中尿素等废物的浓度变化是__________。

(2)透析液的流向与血液相反的原因是_________________________。

(3)对血液进行透析的目的是_________________________________。

(4)比血液透析更好的治疗方法是_____________________________。

患者，男性，65岁，农民，高血压病9年，长期不规则服用降压药，平时常觉胸闷、气短，无咳嗽咳痰。近2个月来胸痛反复发作，休息后好转，1周来发作频繁，来院就诊。查体：T36．5℃，HR89次／分，BP168／88mmHg，口唇发绀，听诊双肺呼吸音清、对称，心律齐、无杂音。

提示：患者住院期间某日清晨突发胸痛不能缓解，HR104次／分，BP95／60mmHg，查ECG出现异常高大不对称的T波，急查血清心肌酶谱：CK及CK－MB升高，考虑急性心肌梗死。提问：此时应对该患者做下述哪些紧急处理？（）

A.立即做动态心电图

B.吸氧，绝对卧床休息

C.拍X线胸片

D.皮下注射吗啡解除疼痛

E.适量镇静减轻患者焦虑

F.在起病3～6小时内溶栓治疗

先天性马蹄内翻足存在的畸形有（）

A.距小腿关节（踝关节）马蹄

B.跟骨内翻

C.小腿肌肉萎缩

D.前足内收

E.胫骨旋转