假如你是李明，最近你的朋友张华因考试不利情绪低落，丧失信心，学习消极应付。请你用英语给他写一封e-mail,指出其消极行为可能带来的不良后果，并结合自身实际提出应采取的积极态度和应对方法，鼓励他努力学习。

    注意：1.词数120左右；

                2.可以适当增加细节，以使行文连贯；

                3.开头和结尾已为你写好，不计入总词数。

Dear Zhang Hua,

     I’m sorry to hear that                                                                                                                       

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                                                                                                                                            Yours,

                                                                                                                                            Li ming

矿石的品位指的是铁矿石含（）。