题目

下图表示两种气体发生化学反应的微观示意图，其中相同的球代表同种原子。你认为下列说法正确的是 A．化学反应前后原子个数没有改变 B．分子是化学变化中的最小微粒 C．反应前后元素的种类发生了改变 D．该反应中分子的种类和原子的种类均没有改变 答案：AE Read and choose (阅读短文，选择正确的答案) Today is the sixth of May. It is Nancy's birthday. She is eleven years old. There is a birthday party in the evening at her home. Many friends come. They all have fun at the party. Helen is listening to music. Yang Ling is playing the piano. Wang Bing and Mike are playing computer games. Now,it is time for the birthday cake. All the children sing “Happy Birthday” together for Nancy. Then,Nancy makes a wish,blows out (吹憶) the candles (蜡烛) and cuts the cake. Everyone enjoys the party very much.() 1 Nancy's birthday is on .     A the six of March    B sixth of May    C the sixth of May() 2 The birthday party is     A in the morning      B in the afternoon     C in the evening () 3 children come to the party.     A Three          B Four       C Five() 4 There are candles on the birthday cake.     A nine           B ten       C eleven() 5 Nancy before blowing out the candles.     A eats the cake     B cuts the cake    C makes a wish