安全标志一般设置在光线充足、醒目、（）视线的地方。
A、稍低于
B、稍高于
C、和视线平齐
D、低于视线
参考答案：B
_____ twelve, Mike started his first novel. [ ]
A. In the age of
B. At his age of
C. At her age of
D. In his age of
白果仁含有白果苷，可分解出( )，食用不当会引起中毒。
A．营养素
B．维生素
C．毒素
D．龙葵素
