问题 填空题 案例分析题

华南虎(又称中国虎)是我国特有的亚种,全球只剩下不到100只,在野外生存的华南虎可能只有l0到30只。影响它们数量的首要原因是人虎冲突。一只虎至少需要15到30平方公里活动空间。近代的人口迅速增长,导致华南虎的栖息地碎裂化、岛屿化,很难满足华南虎的生存和繁殖的要求。第二个原因就是华南虎的很多食物是人类的经济动物,当人们的猎杀使这些动物的种群密度降低到一定程度时,华南虎已经很难生存。

下图是能量流经华南虎种群的示意图,其中A表示华南虎的摄入量。那么,B、D、E依次表示华南虎的()、()、()。而要确保华南虎的能量需求,其生存领地的相关植物所固定的能量至少应达到B的()倍。

答案

参考答案:同化量;呼吸作用散失的能量;流向分解者的能量;25

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Events Calendar

TUESDAY

Landscape Pests (害虫)

Learn to identify, control and prevent seasonal landscape-disease and landscape-pest problems at the workshop, 3:30 pm. – 5 pm. Tuesday at the US National Arboretum, 3501 New York Ave NE, Washington. $15; registration required.

202-245-4521 or www.usna.usda.gov.

THROUGH AUGUST 3

Horticultural(园艺的) Art

Watercolors, pen-and-ink drawings and colored-pencil pieces by the Brookside Gardens School of Botanical (植物学的) Art and Illustration will be on display at the exhibit Botanic 2007: The Art and Science of Plants at Brookside Gardens Visitors Center, 1800 Glenallan Ave, Wheaton, through Aug. 3. Free. 301-962-1400 or www.brooksidegardens.org.

THROUGH SEPTEMBER 9

Botanical Art

Visit Patterns in Nature, an exhibit by Amy Lamb featuring photographs of flowers, leaves and other botanical life, at the US Botanic Garden Conservatory (温室),West Orangerie, 100 Maryland Ave SW, Washington, through Sept. 9. The conservatory is open 10 am. – 5 pm. Daily. Free. 202-225-8333.

THROUGH OCTOBER 8

Botanic Garden Exhibit

Celebrating America’s Public Gardens is on view through Oct. 8 at the US Botanic Garden, 100 Maryland Ave SW, Washington. The exhibit, on the Conservatory Terrace and in the National Garden, features displays of 20 public botanic gardens across the country. Hours are 10 am. – 5 pm. Daily. Free. 202-200-8956.

小题1:If you want to record your name for an event in advance, you may call _____.

A.202-225-8333

B.202-245-4521

C.301-962-1400

D.202-200-8956小题2: If you go to Botanic Garden Exhibit, you _____.

A.can enjoy drawings and coloured-pencil pieces

B.can learn how to kill pests living on the plants

C.can find displays of 20 botanic gardens across the country

D.will enjoy the photographs of flowers and leaves小题3: From the advertisement, we learn _____.

A.the first event is about growing healthy plants

B.all of the events are free of charge

C.there is no time limit to all the events

D.you can find the information of all the events either by phone or by e-mail

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