题目

—Is Tina a________ girl?—No. But she is in ______now. A . Chinese; Chinese B . China; Chinese C . Chinese; China D . China; China 答案：C 某有机物在O2中充分燃烧，生成36 g水和44 g CO2，则该有机物的组成必须满足的条件是(　　) A．分子式一定是CH4 B．分子式一定是CH4O C．分子式可能是CH4或CH4O D．以上说法均不正确