祖母比孙女大54岁，祖母和孙女的年龄和是60岁，那么几年之后祖母的年龄是孙女年龄的7倍( )
A．4
B．5
C．7
D．6
参考答案：D
Though my grandfather is quite old, he is still very _______ and he is enthusiastic about social activities. [ ]
A. active
B. alive
C. awake
D. alone
肉豆蔻含（），有麻醉的作用
A、肉豆蔻油醚
B、龙脑
C、樟烯
D、松油帖
