张涛和佩佩品学兼优，都是班干部，在共同的学习工作中，他们成为了好朋友。

情景一：但由于二人没能把握好情感的缰绳，过早地陷入情感的漩涡，不能自拔，学***幅下降，在中考中都没有考上理想的学校。

情景二：张涛和佩佩常常在一起工作，引得有些同学说起了闲话，这让佩佩感到很害怕。因此她再也不和张涛说话了，看见男同学都躲得远远的。

已知$x=\sqrt{3}+1,y=\sqrt{3}-1$，求下列各式的值

（1）x²+2xy+y²              （2）x²+y²﹣5xy．

某视频中，一只小猫头鹰被人用大手轻轻抚摸，它瞪大了眼睛，显得傻气而乖巧，网友皆呼“萌”。但科学研究表明，它的“萌态”是因恐惧而身体僵硬，动作缓慢。这给我们的启示是（   ）

我国人口最多的民族是：（　 ）

阅读下面短文，从各题所给的A、B、C、D四个选项中，选出最佳选项。

    Jack and Mike are on holiday in France. Mike loves visiting old buildings. Jack likes, too. In the village Jack and Mike see a beautiful old church, but when they come into the church, some people are there. They don't know what the people are doing .

    "Oh! Just sit quietly, and do like the others!" Mike says. Because they don't really know French, so they stand, kneel, and sit to follow other people.

    Then the priest(牧师)says something. The man next to Jack and Mike stands up. "We should stand up, too!" Jack whispers to Mike.

So, Jack and Mike stand up with the man. Suddenly, all the people smile! After that, Jack and Mike walk to the priest. "What's so funny?" Jack asks in English. With a smile on his face the priest says, "Boys, there is a new baby born, we ask the father to stand up."Mike smiles and says, "We should understand what people do before we do like them. "