要给教室的课程表安装铝合金边框，课程表长20厘米，宽18厘米，需要安装多长的边框？课程表的面积有多大？

阅读下面短文, 从短文后各题所给的四个选项(A、B、C、D)中, 选出可以填入空白处的最佳选项。
    Once there was a millionaire, who got a serious eye irritation(发炎). He got a famous doctor to 1 his eyes. The doctor advised him to 2 bright light for one month so he could recover naturally. Immediately the rich man 3 all his windows and replaced all the bright and colorful curtains with dull cloth. He also 4 all the bright chandeliers(枝形吊灯). In one word, he made all his house 5.
    One month later, the doctor paid a visit to the millionaire to ask about the 6 of his eyes. To the doctor's 7, everything in the house had been made dark and dull. Then the doctor said, “You should have bought a pair of 8 to protect your eye from bright light 9 spending so much money on all these things to make your house darker.”
    The same phenomenon(现象) 10 all of us. We often see many 11 in others. We are very 12 to change the attitude and behavior of others which doesn't 13 our own.
    We have many likes and dislikes. 14 other people also have. But we are often interested in imposing(把......强加于) our opinion and thinking on others, 15 we never made any error. Accordingly we want to 16 this world with our own rules and theory.
    However, we 17 that other people who share this world equally with us also think in a similar way and 18 us to behave according to their wishes. Then who 19 your thinking? In order to bring about certain change in the people around us, first it is “we” that have to change.
    20, any needed change can happen when it starts with us.

二次函数y=$\frac{2}{3}$x²的图象如图所示，点A₀位于坐标原点，点A₁，A₂，A₃，…，A_n在y轴的正半轴上，点B₁，B₂，B₃，…，B_n在二次函数位于第一象限的图象上，点C₁，C₂，C₃，…，C_n在二次函数位于第二象限的图象上，四边形A₀B₁A₁C₁，四边形A₁B₂A₂C₂，四边形A₂B₃A₃C₃，…，四边形A_n﹣1B_nA_nC_n都是菱形，∠A₀B₁A₁=∠A₁B₂A₂=∠A₂B₃A₃=…=∠A_n﹣1B_nA_n=60°，则A₁点的坐标为____ ，菱形A_n﹣1B_nA_nC_n的周长为　____ ．

最近几年中日两国在处理钓鱼岛争端、东海海域的管辖和开发等问题上产生重大分歧。这表明

找出每组词语中一个错别字，改正后写在后面的横线上

①____耀武扬威    风和日丽    归根道底    随遇而安

②____呼风唤雨    形态各异    欣喜若狂    漫条斯理

③____腾云驾雾    铿腔有力    热闹非凡    理所当然

④____患难与共    年逾古稀    山洪爆发    欣喜若狂

选择其中一个书写完全正确的词语写句子。____。