▲ 閱讀下文，回答第11–15題
          Art conservation is a challenging and complex field that involves examining, analyzing,documenting, and treating art and objects of cultural heritage. Artworks are __11__ damage throughexternal factors, such as light, direct physical forces, humidity, or thieves. Therefore, conservatorsstrive to retain as much original material as possible and to employ the most carefully consideredmethods available to __12__ any further damage or degradation. To be qualified art conservators,they must complete coursework in chemistry, art history and/or archeology, and studio art. Theytypically hold a master’s degree in the discipline. Professional conservators begin with a visualexamination, coupled __13__  advanced knowledge of art history and artistic techniques, which canbring understanding to the creation, production, and condition of artworks. Art conservators must applysome guidelines and standards of practice. For example, the treatment of each piece must bedocumented with written reports as well as photographs. Modern conservation practice sticks to animportant principle, which emphasizes that treatments should not cause __14__ changes to the object.Art conservation has become an important tool of research, and the accompanying documents are alsoan asset to researchers. These reports are __15__ to the state of an artwork at a specific point in time,with details on any damages, changes, and history.
【題組】11.
(A) sympathetic about
(B) flattered by
(C) overthrown by
(D) subject to