Either you or Tom _____ going to Beijing tomorrow. [ ]
A. are
B. is
C. was
D. were
答案:B
对原因未明的急性中毒,应采用哪种洗胃溶液洗胃()
A.冰水
B.生理盐水
C.1:5000高锰酸钾
D.2%碳酸氢钠
E.2%~4%鞣酸
简述行为主义心理学的主要观点。