问题
单项选择题
骨的化学成分（）
A.主要含有机物和无机物两种成分
B.无机物使骨具有韧性和弹性
C.成人骨有机物与无机物之比为1：1
D.幼儿骨无机物含量较多
E.老年人骨有机物含量较多
答案
参考答案：A
解析：有机物使骨具有韧性和弹性。成人骨有机物约占1／3。幼儿的骨有机物相对较多些，较柔韧；而老年人的骨无机物相对较多，较脆。
搜题请搜索小程序“爱下问搜题”
骨的化学成分（）
A.主要含有机物和无机物两种成分
B.无机物使骨具有韧性和弹性
C.成人骨有机物与无机物之比为1：1
D.幼儿骨无机物含量较多
E.老年人骨有机物含量较多
参考答案：A
解析：有机物使骨具有韧性和弹性。成人骨有机物约占1／3。幼儿的骨有机物相对较多些，较柔韧；而老年人的骨无机物相对较多，较脆。
| 完形填空。 | ||||
| When you're a teenager (青少年) it seems that every time you say, "I want to...", your parents answer, "No, you can't." Young people further complain that their parents do not 1 them. When something goes 2 , most parents just don't believe in their children. 3 asking why, they think their kids are wrong. And not many parents allow their kids to choose for themselves. Yes, 4 is true that your parents sometimes treat you as a little child. But remember that not long ago you were really a child. Your parents still remember the childish 5 you used to make. They want to protect you 6 you don't want them to do so. So, if you want to get 7 freedom (自由), please try to understand your parents and don't lie to them. Try a more friendly way. If you want them to 8 you to stay out late, don't just say "All 9 kids can stay out late." Tell them as much as you can about what you want to do and where you'll be and 10 it's important for you to stay out late. Then they just might say, "Yes". | ||||
|
