问题
单项选择题
Current data suggest that although ______ states between fear and aggression exist, fear and aggression are as distinct physiologically as they are psychologically.
A. simultaneous
B. serious
C. partial
D. transitional
答案
参考答案：D
解析：D项的industrious“过渡的”符合题意。simultaneously同时发生；serious严厉的，严重的；partial部分的，不公正的，都与题意不符。