目前已知的大多数微生物属于（）
A. 化能自养型
B. 化能异养型
C. 光能自养型
D. 光能异养型
参考答案：B
I failed in the final examination last term and only then _____ the importance of studies.[ ]
A. I realized
B. I had realized
C. had I realized
D. did I realize
为什么说法律关系属于思想社会体系？
