简述有效接受的构成条件

二、根据以下资料，回答86～90题

达标湖泊容量2005年比2001年( )。

A．上升了24.3%

B．下降了24.3%

C．上升了24.3个百分点

D．下降了24.3个百分点

色彩丰富鲜艳、具有多色性的染色方法是（）。

A.巴氏染色法

B.吉姆萨染色法

C.瑞氏染色法

D.苏木素-伊红染色法

E.湖蓝染色法

患者男，20岁。发热2周，体温38～39℃，检查皮肤散在紫癜，颈部及腋下可触及5cm×1.5cm大小的淋巴结5～6个，脾肋下3cm，血红蛋白85g/L，白细胞10×10/L，血小板25×10/L。此患者在发热、头痛、呕吐第2日行脑脊液检查，最可能的发现为（）。

A.脑脊液中性粒细胞增高

B.细菌培养阳性

C.脑脊液发现结核杆菌

D.脑脊液蛋白量显著增高、糖定量减低

E.脑脊液白血病细胞增多

It doesn't take a rocket scientist long time to figure out that there are better things you could do for your health than take deep breaths on a smoggy（烟雾的）day. A growing pile of research suggests that even relatively low levels of air pollution may be more harmful than previously realized, to both heart and lungs(肺). The latest articles from researchers, published this week in the New England Journal of Medicine, focuses on how particulate (微粒) matter from air pollution affects lung function.

“The effect of low levels of particulate pollution found in many urban areas is not unlike secondhand smoke,” experts say. Studies show that short-term effects from particulates include diminished（减少） lung function, coughing, wheezing, and heart attacks. Long-term exposure can also slow normal lung growth, damage lung airways, and increase the risk of dying from lung cancer.

Certain populations, such as the very old and the very young, are the most vulnerable to air pollution. However, even the most alarming studies conducted in the most polluted areas suggest that the average person's individual risk from exposure (暴露) is very slight. Relative risk numbers often seem more frightening than they actually are. For example, an earlier study published in the New England Journal of Medicine found that short-term exposure to traffic fumes tripled ( 成为3倍) the risk of heart attacks in heart-attack survivors.

Short of moving to the countryside or at least away from busy roads, shielding yourself from the effects of air pollution is not easy. Masks won't work. “At the very least,” suggests Murray Mittleman, a cardiologist at Harvard University, “people who regularly exercise outdoors near highways may want to consider remapping their route.”

66. What does the underlined sentence in the first paragraph mean?

A. Rocket scientists are making researches on people’s health.

B. It's obvious that air pollution has a bad effect on people’s health.

C. People aren't sure whether taking deep breaths on a smoggy day is bad.

D. People often have a hard time when taking deep breaths on a smoggy day.

67. The word "vulnerable" in Paragraph 3 probably means _________.

A. easy to be hurt            B. easy to be protected

C. easy to be used            D. easy to be saved

68. The main idea of Paragraph 3  is _________.

A. that even small risk from particulate causes big problems

B. that air pollution often leads to heart attack

C. who are most likely to get affected

D. that we shouldn't worry about the average low risk

69. In order to be healthier, you'd better _________.

A. take deep breaths         B. wear a mask   

C. live in a countryside       D. clean the busy road

70. The passage is written in a(n) _________ tone.

A. subjective         B. humorous     C. doubtful      D. objective

臀先露的指示点是（）

A．枕骨 

B．颏骨 

C．骶骨 

D．臀部 

E．面部