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Q31:

Unlike the original National Museum of Science and Technology in Italy, where the models are encased in glass or operated only by staff members, the Virtual Leonardo Project, an online version of the museum, encourages visitors to “touch” each exhibit, which thereby activates the animated functions of the piece. 
                    D

1. exhibit, which thereby activates
2. exhibit, in turn an activation of
3. exhibit, and it will activate
4. exhibit and thereby activate
5. exhibit which, as a result, activates

D 是正确选项, 考平行结构, 但是and 后的activate , 偶觉得应该与encourages 保持一致啊? 应该为activates 啊?