战国时期的墨家和名家提出的理论，标志中国曾出现__
A.形式逻辑
B.辩证逻辑
C.化理学
D.自然哲学
参考答案：A
长期保存细胞的温度应为（）
A.20℃
B.－85℃
C.－196℃
D.－85℉
E.－196℉
News came from the school office _____ Wang Lin had been admitted to Beijing University. [ ]
A. which
B. what
C. that
D. where
