人体内钙主要存在于骨骼、牙齿中，血液中含钙量为（） - 查题网

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成人高等教育 / 幼儿卫生与保健

人体内钙主要存在于骨骼、牙齿中，血液中含钙量为（）

A、
1%
B、
5%
C、
10%
D、
20%

积分

幼儿卫生与保健

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There are some things about myself that I really like. First of all， I always make an effort to do my best. I never give up halfway without trying my best. For example， have practiced the piano for more than twelve years. And now I am learning English every day. Secondly，I'm good at making people laugh. I feel happy when people smile a the things I do. I make friends with anyone easily and now I have a lot of friends. Of course， I also have my weak points. I sometimes feel that I'm a bit selfish or careless. I want to overcome these faults and I believe this will make a man of me and people will love me better.21. What is NOT the author's character? A. Always trying his bestB. Giving up halfway.C. Being good at making people laugh.D. Making friends easily.22. He has practiced the piano for____ ___. A. less than twelve years B. twelve yearsC. almost twelve years D. over twelve years23. He is now trying to every day. A. play the piano B. learn EnglishC. make friends D. overcome his faults24. He is now trying to overcome the fault of. A. making people laugh B. making too many friends beingC. being selfish or careless D. being too proud or particular25. He feels when people smile at the things he does. A. happy B. angryC. selfish D. careless 大学英语（I）

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