If(如果) you don't like reading books, this is for you.

    Have a few laughs (笑声). Sit down with a book of jokes, a picture book or a funny story- book first.

    Ask around. Ask your friends or your teachers about interesting books.

    Find new interests. After reading, you may find an interest in something new.

    Go to the library. Don't be shy (害羞) about asking a librarian (图书管理员) a question like, “Do you have any books about soccer?”

    See the world (世界). When you want to know or see something, you can open the book about it.

    Try to read, you can find there is a lot of fun in books.

PCl₃、POCl₃的部分性质如下：

某兴趣小组模拟该工艺设计实验装置如下(某些夹持装置、加热装置已略去) ：

平均每公顷草场养羊的头数，新西兰高于蒙古18倍多，造成显著差异的主要原因是（  ）

正确量取7.5mL液体，应选用的一组仪器是(    )

①5mL量筒  ②10mL量筒  ③20mL量筒  ④胶头滴管．