题目

从A到F中选择合适的一句，分别填入1题到5题中。注意：有一项多余项。A. The benefits of visiting museumsB. Educational functionsC. Places for collections of objectsD. The history of museumsE. Precious chance to see famous masterpiecesF. Ways to improve their collections Museums are places where collections of objects are preserved and put on show. The objects may be anything found in nature made by man. There are museums devoted to art, science, history, industry and technology. But museums are no longer just storehouse for collections. Today nearly all museums, larg17．已知tanα=-2，求$\frac{4sinα-2cosα}{5sinα+3cosα}$的值．