化简: (1)2x2+(﹣x2﹣2xy+2y2)﹣2(x2﹣xy+2y2) (2

题型:计算题

问题:

化简: (1)2x2+(﹣x2﹣2xy+2y2)﹣2(x2﹣xy+2y2

(2)先化简,再求值:(2a2b+2ab2)﹣[2(a2b﹣1)+3ab2+2],其中a=2,b=﹣2.

考点:整式的加减
题型:计算题

Have you ever stayed in a hotel ? Most Chinese hotels often provide guests with things like disposable(一次性的) toothbrushes , toothpaste , shampoo, and slippers. Many guests like the idea because they don’t have to bring their own . But , if you travel to Beijing , remember to bring your own things. Starting from now on , some hotels in Beijing will no longer provide guests with these disposables. They want to ask people to use less disposable things.

Many disposable things are made of plastic. People throw them away after only using them once. It is a waste of natural resources and is very bad for the environment . Do you know , one Chinese person makes as much as 400Kg of waste a year! Most of that waste comes from disposable things. In Beijing , people throw away about 19,000 tons of plastic bags and 1,320 tons of plastic lunch bowls every year! Plastic can take between 100 and 400 years to break down. So the less plastic we throw out, the better. So, wherever you travel , bring your own things and use them again and again .

Back at home and school, you can also do something to make our world a better place .Try to do these things in your daily life: Use cloth shopping bags , not plastic ones. After using a plastic bag , wash it out and let it dry. Then you can use it over and over again. Do not use paper cups. At your school canteen(食堂), use your own bowl and chopsticks instead of disposable ones.

小题1:Why do many hotels provide guests with some disposable things ?

A.Let their guests be convenient during their travelling .

B.Hope their guests use less disposable things.

C.Wish their guests to save money.

D.Want their guests to use more disposable things .小题2:From the passage we learn that some Beijing hotels will no longer provide guests with __________________.

A.cheap food and drink

B.disposable things

C.good service

D.free TV programs小题3:Which of the following is NOT true according to the passage ?

A.Many disposable things are made of plastic.

B.Throwing disposable things away is a waste of natural resources .

C.Plastic is very bad for the environment .

D.Plastic can be broken down easily.小题4:What can we do to make our world a better place at home and school ?

A.Use shopping bags made of plastic

B.Use disposable plates , bowls and chopsticks .

C.Do not throw away paper cups.

D.Do not forget to reuse daily necessities (必需品).小题5:We can learn from the passage that _________________________________.

A.people don't like disposable things at all.

B.we can't use paper or plastic bowls at school

C.We should use less plastic things and protect our environment

D.hotels won’t provide disposable things because they want to save money

题型:计算题

按照规定,货船的坞内检验每五年进行2次,最长间隔不超过3年,且其中一次在()时进行。

A.初次检验

B.特别检验

C.年度检验

D.法定检验

题型:计算题

公民孙某犯有杀人罪,被判处无期徒刑并剥夺政治权利终身,剥夺政治权利包括剥夺 __________。

A.继承权

B.婚姻自主权

C.出版权

D.恋爱权

题型:计算题

狭义的教育主要是指()。

A.家庭教育

B.职业教育

C.学校教育

D.社会教育

题型:计算题

作者投稿时对自己撰写的论文和期刊要求进行评估,其中自我评估不包括()。

A.所写论文的内容

B.学术水平

C.实用价值

D.学历学位

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