甲组同学撰写论文的主要参考文献有：《保护和发展少数民族特色村寨的思考》 《民族地

It’s reported that many people died of traffic accidents each year. Road safety has aroused the widely attention of the public. Many rules have made to reduce the traffic crashes, especially for the ones involved in the pedestrians. In my opinion, we should make road safety seriously in our daily life. While used the road, we must walk on the pavement and learn to protect us. Besides, car drivers should obey the traffic rules, that is both good for themselves and others.

In the word, obeying the traffic rules are what all of us should pay attention to particularly. After all, life is not a small matter.

自总皂苷元中分离酸性皂苷元，可选用的方法是（）.

A．乙醇沉淀法 

B．胆甾醇沉淀法 

C．分段沉淀法 

D．吉拉尔试剂提取法 

E．铅盐沉淀法

进站信号机以显示（）信号为定位。

A、停车

B、减速

C、进行

蕲蛇的功效是（）

A.祛风湿，利关节，解毒

B.祛风定痛，强筋骨

C.祛风，通络，止痉

D.祛风除湿，和胃化浊

E.祛风通络，利水

法桐新叶的黄化属于（）。

A.生长旺盛

B.生长不良

C.虫害

D.病害