一多发性血栓形成患者，血浆PT、APTT延长，血小板数量正常，凝血因子Ⅶ、Ⅷ活性正常

下图表示某草原生态系统中草原植被、草原鼠类、食鼠动物在一定时间内的数量变化关系，请回答

(1)写出这一生态系统的食物链：__________。

(2)这个生态系统中生物数量会在一定范围内变化，维持相对稳定和平衡的状态，说明生态系统具有一定的__________能力，但这种能力是_________的。

阅读理解。

      Every year, World Blood Day is celebrated by blood services worldwide on 14 June, the birthday

of Nobel Prize winner Karl Landsteiner, the man who discovered the ABO blood group system. If you

have every thought of becoming a blood donor, just register to do it. And you should never worry about

the donation.

     Just under a pint (around 470ml) of blood is taken at one sitting. This amount is no more than 13

percent of your total blood volume, and is quickly replaced by your body.

     It may come as a surprise, but whole blood is only rarely used. Different blood components are used

to treat a range of conditions. None goes to waste. Red blood cells are frequently used to replace heavy

blood loss after an accident, surgery or childbirth. White blood cells and antibodies (抗体) are used to

help people fight infections if their immune system doesn't appear to be responding to antibiotics (抗生

素). Plasma (血浆), the straw-coloured fluid which carries the blood cells and contains proteins, are

used to treat burned patients.

     First-time donors should be aged between 17 and 65, weigh at least 50kg and be in good health. If

you have donated before, you can start being a donor again up to your 70th birthday.

     Although most people are able to give blood, some people who pose health risks or are at a higher

risk of having come into contact with an infectious disease are no tasked to be donors. Pregnant women

or those who have had a baby in the last 9 months should not donate blood.

     Blood has a very short shelf life. Some blood components can be kept longer than others, for instance

red blood cells will keep for 35 days but platelets(血小板)for only five. Remember, you should wait at

least 16 weeks before donating blood again.

1. People should never worry about the donation mainly because _____.

A. it causes no pain to their body

B. being a blood donor is a great honor

C. their bodies can produce new blood soon

D. people have a mature research on it

2. What component of blood is used to treat burned patients?

A. Plasma

B. Red blood cell

C. Antibody

D. White blood cell

3. We can learn from the passage that _____.

A. whole blood is most widely used in hospital

B. platelets can be kept for more than 10 days

C. people can donate their blood four times a years

D. people can donate at most 470 ml of blood each time

4. Who can donate their blood?

A. A teenager who is studying in a primary school

B. A mother who is about to give birth to a new baby

C. An adult who smokes and drinks from time to time

D. A man just coming back for a place suffering from malaria

5. What is the purpose of the author in writing this passage?

A. To teach people how to be a blood donor

B. To give people the knowledge of blood donation

C. To advise people to benefit from blood donation

D. To remind people of the importance of blood donation

慢性化脓性中耳乳突炎单纯型CT表现有()

A．听小骨部分吸收、破坏

B．鼓室粘膜增厚

C．乳突窦或较大的气房粘膜增厚

D．上鼓室、乳突窦入口可见骨壁破坏

E．气房间隔增粗、密度增加

根据我国刑法规定，有期徒刑的期限一般是( )。

A．6个月以上20年以下

B．15 日以上15年以下

C．6个月以上15年以下

D．15日以上20年以下

巴黎系统中放射源间距与放射源肠毒药有关，当放射源长5~9cm时，放射源间距（cm）的限制值为（）

A.0.8~1.0

B.1.0~1.2

C.1.2~1.5

D.1.1~1.8

E.1.5~2.2