以中图法为依据的出版物发行分类，《马克思主义哲学》应归入（）类目。
参考答案：哲学理论
With all his efforts _____ on helping the company survive in the competition, the new manager is loved by all the staff.[ ]
A. concentrated
B. concentrating
C. to concentrate
D. concentrate
中国社会的主要矛盾有哪些？
