下列组织中对传入的超声衰减最小的是（）。
A.肌肉
B.脂肪
C.骨骼
D.血液
E.气体
参考答案：D
根据句意和首字母提示填空。
1. Most young people like p_____ music.
2. — Do you know Zhou Jielun?
— Yes, he is a s______.
3. Do you still r_____ me, Mr Brown?
4. “Let's go swimming tomorrow. " he s_____.
5. China is a g_____ country.
设置长形字，应在“编放”框中选（）。
A.100%
B.150%
C.80%
D.115%
