鹅膏覃碱
参考答案：
是来自毒蘑菇amanitaphalloides二环八肽，能抑制真核RNA聚合酶，特别是聚合酶II转录。
目前，我国家庭电路的电压是_________V，不高于_________V的电压对人体是安全的．
There _____ be any difficulty in passing the road test since you have practiced a lot in the driving school. [ ]
A. shan't
B. shouldn't
C. mustn't
D. needn't
