说到宋词，有人誉称“唱彻宋代的歌声”。当其时，词坛群星璀璨，词风或豪放雄壮，或婉约细腻。其中“婉约细腻”的代表人物是（    ）

对于问题：证明不等式a²+b²≥2ab，甲、乙两名同学的作业如下：

甲：根据一个数的平方是非负数可知（a﹣b）²≥0，

∴a²﹣2ab+b²≥0，

∴a²+b²≥2ab．

乙：如图1，两个正方形的边长分别为a、b（b≤a），如图2，先将边长为a的正方形沿虚线部分分别剪成Ⅰ、Ⅱ、Ⅲ三部分，若再将Ⅰ、Ⅱ和边长为b的正方形拼接成如图3所示的图形，可知此时图3的面积为2ab，其面积小于或等于原来两个正方形的面积和，故不等式a²+b²≥2ab成立．

则对于两人的作业，下列说法正确的是（   ）

计算： $\sqrt{18}$ ﹣2^﹣1+（ $\frac{1}{3}$ ﹣π）⁰﹣4sin45°．

先通读下面的短文，掌握其大意，然后从A、B、C、D四个选项中选择可以填入空白处的最佳答案。    Do you have a good friend? I have one. She's English and1name is Kate.We are in the same (相同的)2and my desk is next to hers.She is nice and I3her well.She always4me with my English and I always tell her how to say "quilt", "grandma", "radio" …in Chinese.She likes reading and she has so many5in her room.They are everywhere — on her bed, on the sofa and on her desk ...Some of them are6the computer.She7it's very important(重要的).Look! This is a8of Kate's family.9people(人)are in it：her parents.her sister, her brother and herself(她自己).Kate's mother Helen is our English10.She teaches well and she's good to us.We like her very much.

由4个相同的小立方体搭成的几何体如图所示，则它的主视图是（　　）