写作.

       今天是3月19日,星期五,外教Johnson先生在课堂上讲了如何提高英语写作能力.请根据以下建议,结合你的看法写一篇日记上交Johnson先生.

1．熟练掌握部分词汇；

2．适当背诵一些美文；

3．坚持每天练习写作.

注意:1.词数:120～150；

         2．可适当增加细节

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An analyst conducted a significance test to determine if the relationship between two variables was real or the result of chance. His null hypothesis is that the population correlation coefficient is equal to zero and his alternative hypothesis is that the population correlation coefficient is different form zero He developed the following information:（）

A. one-tailed test and can reject his null hypothesis. 

B. two-tailed test and can reject his null hypothesis. 

C. one-tailed test and cannot reject his null hypothesis.