20世纪50年代日本发生的水俣病,是因为居民长期食用富含下列哪种元素的鱼虾所致 [ ]
A.汞
B.镉
C.铁
D.锌
答案:A
按实际情况回答小记者的问题。
1. What's the name of your city?
2. Do you live in a house?
3. What's your name?
4. How old are you?
5. What is your favourite shape?
脑血栓形成的主要病因是()
A.脑动脉粥样硬化
B.高血压
C.糖尿病
D.肥胖
E.睡眠呼吸暂停