在许多资料和参考书中都有这样的一道选择题: 例题 在一个密封的玻璃钟罩内,植有绿色植物,并养有以此为食的小动物,罩内的O2用18O原子为标记,每天给予光照,若干时间后,18O可在下列哪项自身组成的有机物中出现( )。 This is a multiple-choice question in many sources and reference books. Example: In a sealed glass jar with green plants and small animals that feed on it, O2 in the hood is marked with 18O atoms. , given the light every day, after a certain period of time, 18O in which of the following self-organized organic matter ().