计算：3$\sqrt{12}$-$\sqrt{48}$

make plans to do＝plan to do. 打算做某事   如：

She ____ go to Beijing.＝She ____ go to Beijing.

判断下面句子各采用了什么修辞手法，填在括号里。

①树像一朵绿色的云，从大地上升起。____

②无数片不同的叶子，做着相同的工作，把阳光变成生命的乳汁奉献给大树。____

③我们每个人都像叶子，为生活的大树输送着营养，让它茁壮、葱翠。____

④无数的叶子在树上找到了自己的位置。____​

阅读短文，从A，B，C，D四个选项中，选出可以填入空白处的最佳选项。

    What do you do after class at your school? You may say you go 1 and do 2 homework. But I think we can have 3 other things to do after class.

    We can 4 different clubs, like the art club and the music club. What can you do? If you swim well, you 5 in the swimming club. Maybe(也许) you can't play the violin 6 the guitar well, but you can 7 to play them at the music club. 8, some people there can help you. I like books and I often go to the 9 club. Do you like books? Come 10 me.