题目

阅读理解We are learning English, but how can we learn English well? Astudent can know a lot about English, but maybe he can not speak English.If you want to know howto swim, you must get into the river. And if you want to be a piano player, youmust play the piano. So, you see, you can learn English only by using it. Youlisten to your teacher in class . You must readyour lessons every day. You must speak English to your classmates and also youmust write in English. Then one day, you may find your English very good. （1） You know a lot about English but maybe you ______. A . can'如图，共有______个三角形．