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问题 单项选择题

甲氨蝶呤的迟发毒性为（）。

A.骨髓功能抑制

B.口腔及胃肠溃疡

C.小脑失调

D.肝损害

E.胃肠道反应

答案

参考答案：A

解析：

本题考查要点是“抗代谢药主要不良反应”。抗代谢药的主要不良反应见下表：根据上表可知，本题的正确答案为A。

单项选择题

不属于中性粒细胞中毒性改变的是（）

A.中毒颗粒

B.空泡形成

C.核固缩

D.棒状小体

E.细胞大小不均
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单项选择题

Are you a man or a mouse When people ask this question they want to know (1) you think you are a (2) person or a coward. But you will never really know the answer to this question (3) you are tested in real life. Some people (4) they are brave but when they come face to face with real (5) , they act like cowards. Others think of themselves as cowards, but when they meet danger, they act like (6)

Lenny had always thought of himself as a (7) person. He got worried before examinations. He worried about his job and health. All he wanted in life was to be safe and healthy. (8) , on January 15th, 2002, a plane crashed into the Potomac River in Washington. Lenny went to the river to see what was happening. He saw a woman in the (9) water. Lenny did not feel afraid. He kept very (10) and did a very dangerous thing. He jumped into the Potomac, (11) to the woman, and kept her head (12) the water. Seventy-eight people died that day. Thanks to Lenny, it was not (13) .

When you are in a very (14) situation and feel afraid, the body automatically produces a chemical in the blood. The chemical is called adrenalin. (15) adrenalin in the blood system, you actually feel per and per and are (16) to fight or run away. However, when you are absolutely terrified, the body can produce too much adrenalin. When this (17) , the muscles become very hard and you find you (18) move at all. You are then paralyzed with fear. This is (19) when we are very frightened, we sometimes say we’re "petrified". This word comes from the Greek word "petros", which means "stone". We are (20) frightened that we become stonelike.

12（）

A.in 

B.under 

C.above 

D.from
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