完形填空（共20小题，每小题1.5分,满分30分）

阅读下面短文，掌握其大意，然后从36—55题各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项。

Most people make treehouses using a pile of wood, a hammer, and some nails. Mitchell Joachim, an architect from the Massachusetts Institute of Technology, has a(n) _36_ vision. He pictures a day when homes will be created from __37__.

Joachim's vision ___38__ an idea called pleaching (编织), where tree branches are grown so that they __39__ weave together. Since the growth patterns of trees are  _40_ by wind and sunlight, it may be __41_ to control the way a tree develops.

These Fabricated Tree House Habitats would use trees grown into shapes as housing. One of the __42_ of these designs is that trees would not have to be cut down __43_.

"A 100 percent treehouse would take _44_ to create," Joachim said．__45_ the climate, a house could take anywhere from 5 to 30 years to grow. Fortunately, there's a way to __46_ the process. Joachim suggests including __47_ materials such as sod (草皮), grasses and living branches in the housing designs. "This material would be able to move __48_ the house grows," Joachim said．

A home would become an actual ecosystem, a community of plants, animals, and bacteria working together. The trees would also give off water vapor that would assist in _49__ the homes. Solar panels and wind would help provide  _50__. The tree homes might even have soil pockets, __51_ plants could grow from the structure itself.

Work has already __52_ on Joachim's first design—a house made from 50 percent recycled and 50 percent living things. Joachim is confident about the __53__ of his work, as he uses natural products _54_ nature.

"The environment and its study are very important. We need to respect nature, don’t _55_," he said．

36．A．similar     B．excellent C．strange     D．different

37．A．living trees      B．small trees       C．living things     D．wild plants.

38．A．agrees with      B．is considered as      C．is based on     D．comes up with

39．A．luckily    B．naturally        C．partly      D．separately

40．A．effected   B．affected  C．attempted        D．intended

41．A．possible   B．impossible       C．important        D．necessary

42．A．designers        B．purposes C．disadvantages D．advantages

43．A．on purpose      B．for wood C．by chance        D．at ease

44．A．troubles   B．great efforts    C．a few months   D．years

45．A．Depending on B．Judging by      C．Protected from       D．Suffering from

46．A．speed up B．carry on   C．slow down       D．smooth away

47．A．compound       B．chemical C．ecological       D．industrial

48．A．for    B．as     C．so     D．because

49．A．cleaning   B．heating    C．cooling    D．lighting

50．A．food        B．energy     C．beauty     D．charming

51．A．where      B．which      C．that D．and

52．A．stopped    B．completed       C．controlled       D．begun

53．A．pleasure    B．happiness        C．benefit     D．importance

54．A．going against   B．without destroying C．by destroying     D．coming from

55．A．think you are it       B．do it ourselves        C．take it for granted    D．put it like this