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问题 选择题

下列属于纯净物的是

A．铁锈

B．无水酒精

C．加碘盐

D．蛋壳

答案

答案：B

题目分析：纯净物只含一种物质，铁锈中有铁和铁锈两种物质，酒精中只含酒精一种物质，加碘盐中含有食盐和碘酸钾等多种物质，蛋壳中有杂质、碳酸钙等多种物质.

单项选择题

华东理工大学网络教育的学习支持服务体系由哪几部分构成？（）

A.院学习支持服务中心、校外教育中心、班主任

B.院学习支持服务中心、班主任

C.院学习支持服务中心、校外教育中心
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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.

Notes: childhood amnesia 儿童失忆症。

14（）

A.instincts

B.feelings

C.sensations

D.experiences
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