Mobile phones are becoming more and more popular not only with____(grown-up) but also with students. Meanwhile,they also____(become) a problem for middle schools in the past few years.Some children have got mobile phones____Christmas or birthday gifts,and more will still want them.

    Many like SMS because it is____(ease) and quick.Some parents felt happy because they could communicate with their children.Some teachers said mobile phone use____(be) a distraction（分心的事）to students during school hours and____also gave them much trouble in their classrooms.Sometimes students might use phone messages____(cheat) during exams.A new study found that some teenagers sending messages in class even hurt their fingers because they can't stop____(send) SMS.

    Many teachers suggested that students should not have phones at school,but if there was a good reason,they could leave their phones at school office.And even they can use the telephone in the teachers' office instead.Many people think they understand the reason____parents would want their children to have them,but they agree schools should tell the students____(use) their mobile phones at proper times.

为了炼出某种特定用途的钢材，炼钢时需要加入一定量的某种化学元素，已知每炼1吨钢需要加入这种化学元素的量在1000，2000内（单位：g），采用0.618法确定最佳加入量，设第1，2，3个试点的加入最分别为x₁，x₂2，x₃（x₁＞x₂），若第1个试点比第2个试点好，则第3个试点的加入量x₃=____

关于函数$f\left(x\right)=2\left(\sin x-\cos x\right)\cos x$的四个结论：

P₁：最大值为$\sqrt{2}$；

P₂：把函数$f\left(x\right)=\sqrt{2}\sin 2x-1$的图象向右平移$\frac{\mathrm{\pi }}{4}$个单位后可得到函数$f\left(x\right)=2\left(\sin x-\cos x\right)\cos x$的图象；

P₃：单调递增区间为$k\mathrm{\pi }+\frac{7\mathrm{\pi }}{8},\mathrm{k}\mathrm{\pi }+\frac{11\mathrm{\pi }}{8}$，$k\in Z$；

P₄：图象的对称中心为($(\frac{k\mathrm{\pi }}{2}+\frac{\mathrm{\pi }}{8},-1)$，$k\in Z$．

其中正确的结论有(    )

选择句子的翻译。

①请问、去超市怎么走？____       A. Nice to meet you.

②一直向前走，然后向右转____    B. Go straight on, then turn right.

③小明在学校附近。____              C.Excuse me. Where is the supermarket?

④见到你真高兴。____                 D. Xiaoming is near the school.

①大众传媒是现代文化传播的主要途径

②大众传媒日益显示出文化传递、沟通、共享的强大功能

③为人民大众喜闻乐见的社会主义文化才是我们所倡导的大众文化

④影视作品的创作一定要充分保障人民群众的基本文化权益