大牛求助

terence09

请问delta

delta P21 Exercise 1.1A 第7题 解释给的clue是这句话The third system-the ground tissue- makes up the bulk of a plant, filling all of the spaces between the dermal and vascular tissue systems. Ground tissue functions in photosynthesis, storage, and support.。但是如何才能判断Which type of tissue does a plant's body mainly consist of? 凭什么说就是这个ground tissue？貌似没有明确指出这个ground tissue就是最主要的组成啊。