单项选择题
（）is an intensive study of a specific individual or specific context, which is usually based on the assumption.
A.Action researchB.Teaching journalC.Lesson reportD.A case study
单项选择题 （）说：“竞争可以在相当广阔的范围内培植进取心、毅力和大胆首创精神。”
单项选择题 Which one do you think is not the correct statement（）.
单项选择题 毛泽东1942年所写《()》，是以马克思主义理论对文化进行阐述。
