关于声现象的说法中,正确的是 [ ] A.在雨天打雷时,我们总是先听到雷声,后看

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问题:

关于声现象的说法中,正确的是 [ ]

A.在雨天打雷时,我们总是先听到雷声,后看见闪电

B.电视机上的“音量”按钮是用来调节音调高低的

C.敲门时,门的响声是由门的振动产生的

D.燃放鞭炮的声音一定不是噪声

考点:声音的产生噪声及来源声速音调的概念
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The mayor of Beijing says that all construction work for the Beijing Olympics ____ by 2006. 

A.has been completed

B.has completed

C.will have been completed

D.will have completed

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各部门、各单位的预算支出,必须按照本级政府财政部门批复的预算科目和数额执行,不得挪用;确需作出调整的,必须经本级政府财政部门同意。()

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高温汽水样品必须通过冷却装置降温后取样,应保持()和()。使样品温度保持在()以下。取样过程中如遇冷却水中断,应立即()。

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城市布局形式是城市总体布局带有原则性的重大问题。 ( )

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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.

15()

A.impressions

B.beliefs

C.minds

D.insights

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