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问题 选择题

下列曲线能正确表示人体内酶的催化效率与温度的关系是（  ）

答案

答案：A

题目分析：所有的酶都是专一的，一种酶只催化一种或一类化学反应，所以酶有很多种．并且酶具有生物活性，酶促反应速度受酶浓度和底物浓度的影响，也受温度、pH、激活剂和抑制剂的影响．对于温度要求比较高，温度较高或较低都会使消化酶失去生物活性．只有在适宜的温度时，其生物活性才最高．

单项选择题 A型题

颈段高位食管癌因颈部与胸部体厚相差较大常需加楔形板，那么楔形板使用的方向为（）

A.横向放置，厚端在患者左边，尖端在右边

B.横向放置，厚端在患者右边，尖端在左边

C.纵向放置，厚端在患者头端，尖端在脚端

D.纵向放置，厚端在患者脚端，尖端在头端

E.垂直放置，厚端朝机头，尖端朝患者
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单项选择题

What’s your earliest childhood memory Can you remember learning to walk Or talk The first time you heard thunder or watched a television program Adults seldom (1) events much earlier than the year or so before entering school, (2) children younger than three or four (3) retain any specific, personal experiences.

A variety of explanations have been (4) by psychologists for this "childhood amnesia". One argues that the hippo-campus, the region of the brain which is (5) for forming memories, does not mature until about the age of two. But the most popular theory (6) that, since adults don’t think like children, they cannot (7) childhood memories. Adults think in words, and their life memories are like stories or (8) one event follows (9) as in a novel or film. But when they search through their mental (10) for early childhood memories to add to this verbal life story, they don’t find any that fit the (11) It’s like trying to find a Chinese word in an English dictionary.

Now psychologist Annette Simms of the New York State University offers a new (12) for childhood amnesia. She argues that there simply aren’t any early childhood memories to (13) . According to Dr. Simms, children need to learn to use someone else’s spoken description of their personal (14) in order to turn their own short-term, quickly forgotten (15) of them into long term memories. In other (16) , children have to talk about their experiences and hear others talk about (17) — Mother talking about the afternoon (18) looking for seashells at the beach or Dad asking them about their day at Ocean Park. Without this (19) reinforcement, says Dr. Simms, children cannot form (20) memories of their personal experiences.

13（）

A.recall

B.remember

C.reflect

D.respond
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