题目

假如你是小明，你的朋友小东是一名高一的学生，他在英语学习上有困难，他想改变现状。请你根据下面的要点给他发一封邮件给他一些建议。⒈经常复习单词、短语⒉上课认真听讲，不懂就问⒊多与同学用英语交流注意：⒈词数：100-120左右；⒉可适当增加细节，以使行文连贯。 答案：Dear Xiao dong, I'mvery sorry that you have difficulty in learning English. However, the situationis easy to change if you take my advice. Here are some tips for you to follow.Firstly, it is very useful for you to go over the words and expressionsregularly. If you do this, you can use them freely whenever you want to.Secondly, I find it necessary for you to listen to your teacher carefully andask设全集为R，对a＞b＞0，集合M=，，则M∩CRN=    ．