题目

阅读下面短文, 在空白处填入1个适当的单词或括号内单词的正确形式。Many people have the hobby of collecting things, e.g. stamps, postcards or antiques. In the 18th and 19th centuries, 【1】 (wealth) people travelled and collected plants, historical objects and works of art. They kept their collection at home until it got too big 【2】 until they died, and then it was given to a museum. The 80,000 objects collected by Sir Hans Sloane, for example, 【3】 (form) the core collection of the British Museum 【4】 opened in 1759.The parts of a museum open to the publi小萌在利用完全平方公式计算一个二项整式的平方时，得到正确结果4x2＋20xy＋■，不小心把最后一项染黑了，你认为这一项是( )A. 5y2 B. 10y2 C. 100y2 D. 25y2