题目

Many Chinese students find it difficult to learn English. But not Chinese, because Chinese is their mother tongue. Actually Chinese is much   1  to learn than English. Still some students in other countries can speak Chinese very   2  .If you didn’t see them, you would   3   them for Chinese. What makes them   4  ? “For me, conversation is the most helpful. I try to   5  in Chinese. If you only listen to what others speak, you’ll be good at   6   , but if you talk as much as you can, you’ll find you can speak good   7  ,” said Jenny Brown, an English girl  8 下列变化中，没有发生化学变化的是A.二氧化硫在空气中造成酸雨B.气球充入过量空气爆炸C.铁钉在潮湿空气中生锈D.把黄豆加工厂豆腐