| A.Light. | B.Ceilings. | C.Windows. | D.Furniture. |
| A.the shape of furniture may affect people’s feelings |
| B.lower ceilings may help improve students’ creativity |
| C.children in a dim classroom may improve their grades |
| D.students in rooms with unblocked views may feel relaxed |
| A.the problem is not approached step by step |
| B.the researches so far have faults in themselves |
| C.the problem is too difficult for researchers to detect |
| D.research in this area is not enough to make generalized patterns |
