Do remember to be ________. We must avoid any possible risks when doing this dangerous chemical experiment—burns, poisonous gases or cuts from broken tubes.

A．cautious

B．thoughtful

C．considerate

D．curious

乌头中毒的主要临床表现（）。

A.恶心呕吐、口中有金属味；腹痛腹泻；口腔黏膜充血，牙龈肿胀溃烂

B.胸闷；心悸；喉咙干痛；四肢无力；心电图是显示房室传导阻滞

C.头晕；头痛；烦躁不安；面部肌肉紧张；吞咽困难；伸肌与扁肌同时收缩

D.严重脱水；低蛋白血症；水肿；精神错乱；幻觉；癫痫样发作

E.口舌；四肢及全身麻木；头痛；头晕；精神恍惚；牙关紧闭；呼吸衰竭