Darwin was convinced that the loss of these tastes was not only a loss of happiness,

参考答案:

本题考查点是宾语从句。主干是Darvin was convinced that…。其中宾语从句的结构是the loss of these tastes was not only…, but…be injurious to …, and to …。　　参考译文：达尔文认为，对(音乐和绘画方面)兴趣的丧失，失去的不仅仅是一种乐趣，而且可能会伤害到智力，更有甚者还可能伤害到道德。