题目

 下列说法正确的是 A. 焰火的五彩缤纷是某些金属元素化学性质的展现 B. Na2O中阴、阳离子的个数比为1∶1 C. 向氯化铝溶液中加入过量氨水反应的实质是Al3＋＋3NH3·H2O===Al(OH)3↓＋3NH D. 将等物质的量的氧化钠和过氧化钠分别投入到足量且等质量的水中，得到溶质质量分数分别是a%和b%的两种溶液，则a和b的关系是a<b阅读短文，从方框中选择恰当的词并用其适当形式填空，使短文完整、通顺。每词限用一次，其中有两个词是多余的。易读度★ ★ ☆it,drive,hear,big,unless,but,still,visit,until,favorite,sell,problem     London stands on the River Thames. From 1831 (76) 1925,London was the biggest city in the world but now there are many cities which are much (77) .    London is famous for many things. People come from all over the world to (78)  its historical buildings,such as Buckingham Palace,where the queen(女王) lives,and the Houses of Parliament,where they can see and (79) the famous clock,Big Ben. They also come to visit (80) theaters,museums and shops.And of course they want to ride on the London Eye next to the river!    Like many other big cities,London has (81) with traffic and pollution. Over 1 000 000 people a day use the London Underground (伦敦地铁) . People who want to (82) into the city center need to pay £8 a day,but there are (83) too many cars on the streets. The air isn’t clean,(84) it is cleaner than it was 100 years ago.    For me,the best thing about London is the parks. There are five in the city center. But my children’s (85) place is Hamleys,which is probably the biggest toy(玩具) shop in the world.