甲,乙,丙,丁是初中化学中常见的四种物质,它们有如下关系:①甲+乙→H2O ②乙+丁→CO2 ③丙+丁→CO2+H2O。则丙物质可能为( )
A:C
B:CO
C:H2
D:C2H5OH
南极地区被称为“白色荒漠”的原因是( )
After seeing children die of malaria(疟疾) in Hainan Island, Tu Youyou decided to c____ her life to the research.
选择正确解释
昂首观之,项为之强 ( )