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下图中A、B、C、D是四种粒子的结构示意图，E是钙元素在元素周期表中的信息。请回答下列问题（填序号）：

（1）A、B、C、D四种粒子结构示意图中，属于离子的粒子是______；属于同种元素的两种粒子的是_________；

（2）A粒子的化学性质与B、C、D中哪一种粒子的化学性质相似______；

（3）D中x＝______；从E图中你获得的信息有________________________________

________________________（答一条）。

答案

（1）B；  A B（2分）      （2）C    

（3）8；   钙的相对原子质量为40.08

根据图中A、B、C、D是四种粒子的结构示意图，E是钙元素在元素周期表中的信息可知：

（1）根据元素元素的概念：具有相同核电荷数（核内质子数）的一类原子的总称．则可知A、B、C、D四种粒子结构示意图中，属于同种元素的粒子是A、B；

（2）化学性质与粒子的最外层电子数有关，故可知A粒子的化学性质与C粒子的化学性质相似；

（3）D中X=8；从E图中你获得的信息有：钙元素的原子序数为20．（答一条）

单项选择题

具有沉降性质的性味是

A．苦温

B．辛温

C．苦寒

D．辛寒

E．咸温
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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。

19（）

A.habitual

B.verbal

C.unique

D.particular
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