“五一”假期就快到了，我们将会有三天的假(Thursday, Friday and Saturday)。请以“My May Day holiday plan”为题, 写一篇80字左右的短文，介绍你和你的家人或朋友的假期活动安排。开头已给出。

下列词汇供参考：morning, afternoon, evening, stay in bed, do my homework,

get up early, play football, have a picnic…

同学们还可以自由发挥。

May Day is coming soon. We will have a 3-day holiday.  I am going to……      

川乌的剧毒成分为（）

A.异喹啉类生物碱

B.双蒽酮苷类

C.双酯类生物碱