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晓明同学所在的学习小组完成对我国1元硬币(如图所示)各参数的正确估测后,想知道它是由什么金属制成的,从而需要测量出它的密度.

晓明同学设计的方案是:用刻度尺测出一枚崭新的1元硬币的厚度;再用刻度尺测出它的半径;从而算出硬币的体积,然后将它放在天平上测出其质量,最后由密度公式算出硬币的密度.

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     Teaching your child to read can be one of the most rewarding(值得的) experiences you have as a parent.

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      Nothing can replace the head start(起步时的优势)that a child receives from becoming familiar with books and the way that the written word sounds when read aloud. If your child sees that reading is important to you, then he will be much more likely to want to learn how to read himself.

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       If your child shows interest in learning letters and looking through books, he may be ready to begin learning to read. Learning how to read cannot be rushed. If your child has no interest in learning his letters, then wait a month or so and try again.

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      You can make this fun, such as saying “I see a k-æ-t-cat” whenever you see a cat. The sound of a letter is much more important than a letter's name because the child will need to combine the letter sounds to make words.

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      Some children learn their letters faster by seeing or hearing them, while other children learn letters by using their bodies. Encourage your child to draw the letter and then paste pictures of something that begins with that sound onto the letter. Sing songs about the letter. Read your child a story that repeatedly uses that letter sound.

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      Rather than try to teach a child 26 new letters at one time, focus on one letter a day or a week. This enable the child to master each letter sound and feel proud of himself/herself for doing so.


A. Read to your child daily.

B. Show your child your love for reading.

C.  Make sure your child is ready to begin learning how to read.

D. Focus on one letter at a time.

E. Teach your child the sound of each letter.

F. Use sight, sound and touch as you teach each letter.