题目

已知关于的方程有一个正根，则实数的取值范围是______________。 答案：。14．Zhalong is a nature reserve in Heilongjiang in northeast China．It is one of the world’s most important wetlands．The area provides food and shelter for wildlife．It is an ideal home for different kinds of plants，fish and birds．Many birds live comfortably in Zhalong Nature Reserve all year round，while some only stay for a short time．There are many fish in the wetlands，and the birds can easily catch them for food．Zhalong Nature Reserve is an important living area for the rare red-crowned cranes．There are not manyred-crowned cranes in the world．Some of them live in Zhalong．Some people want to change the wetlands to make more space for farms and buildings．This means that there will be less and less space for wildlife．More and more birds are in danger because they do not have enough living space．Many of them died．The Chinese government wants to protect these endangered birds，and they can be safe in Zhalong．Every year a lot of tourists go to Zhalong to watch birds．This year members of ourBird watching Club are going to study the different kinds of birds in Zhalongand the changes in their numbers．The study begins next month．We do a bird count once a year．We are now inviting secondary school students to help．We need more people to help us count and do something to help the birds．Many people do not understand the importance of the wetlands．We hope this information will help them understand and make them actively take action to protect wildlife．36．What is the best title of the passage？DA．Less and Less Space for WildlifeB．Many Tourists Watch birds in Zhalong YearlyC．Zhalong is a Famous Scenic SpotD．Zhalong A Special Place37．The shelter in the first paragraph meansA．A．a place to live or stay                 B．a large zooC．a place to hunt animals               D．a large park38．Which of the following sentences is false？AA．There are a lot ofred-crowned cranes in other parts of the world．B．Some birds go to Zhalong for a short stay．C．Zhalong nature reserveis the comfortable home of many birds．D．Birds can find food without difficulty in Zhalong．39．Why are more and more birds endangered？BecauseD．A．many tourists watch them           B．many of the birds diedC．people have less and less place         D．their living place is less and less40．This passage is written toBA．ask people to do something for birds．B．help people learn about protecting wildlife．C．make people understand how important the wetlands are．D．ask students all over the world to watch birds．