1）说明写信的目的；

2）对这些行为提出批评；

3）提出建议。

注意：1）词数100左右；

2）可适当发挥，以使行文连贯；

3）邮件的开头和结尾已给出，不计入总词数。

Dear Mr. Headmaster,

    I am Li Hua, a student from Class One, Senior II.     

    Best wishes!

    Yours,

    Li Hua

It's 7 o'clock It's time for .____

我当小裁判。

    There is a zoo in our city. It's very big. In the zoo, there are many animals. Look, the birds are singing in the tree. A bear is riding（骑）a bike. A tiger is eating meat（肉）. Two monkeys are climbing(爬）a tree. They are happy in the zoo. 

阅读短文，判断正误。

在“用托盘天平称物体的质量”的实验中，下列操作错误的是（　　）