We had no trouble finding your house because your directions were definite（）
A. instructions
B. streets
C. stories
D. positions
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We have various seafood at the entrance of therestaurant（）
A. changeable
B. different
C. difficult
D. suitable
关于知识表示方法的叙述，正确的有（）
A. 结构化的知识宜采用框架表示法
B. 具有因果关系的知识宜采用产生式表示法
C. 若问题的解答出现在所分解的状态中，则宜采用状态空间表示法
D. 状态空间表示法适用于规则性的知识
They developed their relationship in the new fields（）
A. studied
B. made
C. learned
D. improved
He rarely speaks to others these days（）
A. always
B. seldom
C. often
D. usually
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