In the future，we could all work and live in buildings with their own ecosystems（生态系统）．They are made to produce more energy than they use．

    Toby is an engineer from Europe．He has now made wonderful models showing what this new building could look like．

    He said he was suggested by a kind of tree to create the towers．The Hyperion，found in Northern California，is the tallest tree in the world，reaching 115m．The buildings will be 120m high and have 1000 homes，offices and working spaces，gyms，restaurants and swimming pools．

    Because of the ecosystem，the buildings will also make fewer diseases．

    The buildings will have city farms and small animal farms producing eggs and milk．"Farming can bring methane （甲烷）that produces energy，then the energy is supplied to homes，"said Toby．

Toby has had many excellent designs （设计）．At the end of last year，he also showed designs for eco﹣friendly（环保的） ocean buildings．

    The eco﹣friendly buildings don't need coul or oil as they produce their own energy and heat．

46．What is the name of the tallest tree in the world？　　．

A．California          

B．Toby         

C．The Hyperion

47．How high will the buildings be？　　．

A.115m        

B.120m         

C.1000m

48．The energy of the homes in the buildings comes from 　　．

A．methane        

B．coal        

C．oil

49．Which of the following is NOT true？　　．

A．The engineer is from Asia     

B．The buildings will also make fewer diseases．

C．The engineer has had many excellent designs．

50．The passage mainly talks about 　　．

A．ecosystems          

B．eco﹣friendly buildings    

C．eco﹣friendly ocean buildings．