His pen is ______ the lost and found case.[ ]
A. in
B. at
C. for
答案：A
I meant to help him. _____, he didn't accept my offer. [ ]
A. But
B. As a result
C. Therefore
D. However
思维的主要特征为( )。
A．间接性和概括性
B．分析性和概括性
C．间接性和整合性
D．分析性和整合性
