题目

阅读理解What comes to mind when you think of a museum? Perhaps you picture an impressive building in a rather traditional design made of high-quality stone? Some might consider these customary institutions the best way to safeguard the future of typical educational topics. But according to the Museums Association, a museum is traditionally defined as a place enabling … people to have more knowledge via various collections for inspiration, learning and enjoyment.There are about 2500 museums in the UK; a few are bound to be considered a little unconventional, unusual or even unknown. Howev下表各组中，实验操作和目的对应关系不正确的是（ ）① 加热试管时，先均匀加热后集中加热防止试管炸裂②量取液体时，视线与凹液面最低处保持水平防止读数误差③用双氧水制氧气时，加入少量二氧化锰加快氧气生成速度④铁丝在氧气中燃烧时，集气瓶底部放少量水使实验现象更加明显A．①B．②C．③D．④