问题 单项选择题

新生儿红细胞计数的参考值为()。

A.(4.0~5.5)×1012/L

B.(4.2~5.2)×1012/L

C.(3.5~5.0)×1012/L

D.(6.0~7.0)×1012/L

E.(5.0~6.0)×1012/L

答案

参考答案:D

解析:本组题考查要点是“红细胞计数的正常参考区间”。红细胞是血液中数量最多的有形成分,在正常情况下几乎占血容量的1/2,故使血液呈红色黏稠的混悬液。红细胞为双凹圆盘形,其主要生理功能是作为呼吸载体,能在携带和释放氧气至全身各个组织的同时运输二氧化碳,协同调节维持酸碱平衡和免疫黏附作用。免疫黏附作用可增强吞噬性白细胞对微生物的吞噬作用,消除抗原抗体复合物的作用,防止复合物在易感区域形成可能有害的沉淀物。正常参考区间为:新生儿(6.0~7.0)×1012/L;婴儿(5.2~7.0)×1012/L;儿童(4.2~5.2)×1012/L;成人男性(4.0~5.5)×1012/L;成人女性(3.5~5.0)×1012/L。

阅读理解

阅读理解

      The year was 1932. Amelia Earhart was flying alone from North America to England in a small

single-engine airplane. At midnight, several hours after she had left Newfoundland, she ran into bad

weather. To make things worse, her altimeter failed.(The altimeter shows the height of the plane above

the ground.) At night and in a storm, a pilot is in great difficulty without an altimeter. At times, her plane

nearly plunged into the Atlantic Ocean.

     Just before daylight, there was further trouble. Amelia noticed flames coming from the engine. Would

she be able to reach land? There was nothing to do except to keep going and to hope.

     Amelia Earhart did reach Ireland, and for the courage she had shown, she was warmly welcomed in

England and the rest of Europe. When she returned to the United States, she was honored by President

Hoover at a special dinner in the White House. From that time on, Amelia Earhart became famous.

     What was so important about her flight? Amelia Earhart was the first woman to fly the Atlantic Ocean

alone, and she set a record of fourteen hours and fifty-six minutes.

1. Amelia's flight was important because __________.

A. Amelia was a woman pilot

B. She set a record for the flight

C. Amelia was the first woman to fly across the Atlantic alone

D. Amelia was able to overcome the difficulties during the flight

2. She ran into bad weather. Here "ran into" means __________.

A. rushed into

B. raced into

C. met into

D. met with

3. Amelia's successful flight proved that __________.

A. women can do everything

B. women can do tings that men have done

C. men and women are equal now

D. women pilots are more successful than men pilots

4. The best title for this passage would be __________.

A. Amelia Earhart

B. A Woman Pilot

C. A Flight

D. An Honoured Women

判断题