B．a biological creature

C．a given area

D．the maintenance of the ecosystem

E．the source of food

F．various species

28、 Plants are essential in an ecosystem because to other living creatures they are_______

A．our share of resources

B．a biological creature

C．a given area

D．the maintenance of the ecosystem

E．the source of food

F．various species

29、 Plants, animals and humans are all effective in_______

A．our share of resources

B．a biological creature

C．a given area

D．the maintenance of the ecosystem

E．the source of food

F．various species

30、 To protect our ecosystems we should not use more than_______

A．our share of resources

B．a biological creature

C．a given area

D．the maintenance of the ecosystem

E．the source of food

F．various species

第4部分：阅读理解(第31-45题，每题3分，共45分)下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。

31、回答31-45题

Energy and Public Lands

　　The United States boasts substantial energy resources. Federal lands provide a good deal ofUS energy production, the U. S. Department of the Interior manages federal energy leasing ( 租赁) both on land and on the offshore Outer Continental Shelf Production from these sourcesamounts to nearly 30 percent of total annual US energy production.

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