GRE Reading Comprehension: OG/PP2-GRE阅读OG/PP2 - YXET6CW46T74U234P

It can be inferred that the greenhouse roof is designed to allow for which of the following? A. The avoidance of intense solar heat inside the greenhouse B. The entry of sunlight into the greenhouse to make the plants grow C. The mixture of heated air with greenhouse air to enhance the collection of moisture