Hangzhouhua (杭州话)：use it or lose it
   There are about 6.000 languages in the world and some experts say that as many as half of these languages will disappear(消失) in the next one hundred years. Will Hangzhouhua be one of ____ ? It's a ____  that more people are asking.
   In China, Putonghua is the official language. That ____  it's the language of government, business and the media (媒体). And it's also the language that is____  in schools.
   Hangzhou is a special city. It used to be the capital of Wu and Yue States in the 10th century during the Five Dynasties period. Now it is modern, fashionable and also beautiful. And Hangzhouhua shows that by being modern, fashionable and beautiful.
   Young people still speak Hangzhouhua but not as ____  as their parents and grandparents. They are under more and more pressure to speak Putonghua. So the language is being used____  often in everyday life. Some people want to keep the language from disappearing completely ____  building museums and having cultural festivals to save it. But a language isn't a painting ____ a book. It's a living thing and you ____  use it or lose it.
   If people ____  using it in their daily lives, a museum or a festival will not help. It will be lost forever, like the Yangtze River dolphin.

下列经济开发区不属于黄土高原区域的是（　　）

下列关于生活中常见热现象的解释，错误的是（　　）

（2015•临沂）定义：给定关于x的函数y，对于该函数图象上任意两点（x₁，y₁），（x₂，y₂），当x₁＜x₂时，都有y₁＜y₂，称该函数为增函数，根据以上定义，可以判断下面所给的函数中，是增函数的有　____ 　（填上所有正确答案的序号）

①y=2x；②y=﹣x+1；③y=x²（x＞0）；④y=﹣$\frac{1}{x}$．

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