人体组织和体液中，哪一种最少引起声衰减()
A．血液
B．胆汁
C．皮下脂肪
D．肌肉
E．肝脏
参考答案：B
对造成环境严重污染的企业事业单位，应该( )。
A．收缴排污费
B．限期治理
C．予以警告
D．关闭
— What a lot of fun it is to visit Taiwan!
— Isn't it rather risky, ____? It is reported that the typhoon is coming![ ]
A. though
B. also
C. either
D. too
