16
60亿 World po 1987翠 40亿 (1975年) 30亿 20亿 10亿 5亿 1575 1830 193019601999(年) World population 世界人口每增加10亿所用的时间。 17
17 World population 世界人口每增加10亿所用的时间。 World po
Endangered or Threatened Species(2) Giant panda Black-footed ferret Whooping crane Northern spotted owl Blue whale Mountain gorilla Florida panther California condor Hawksbill sea turtle Black rhinoceros @Cengage Leaming
18 Endangered or Threatened Species (2)
动时dog 19 Mountain gorlla Cafdixtrla condor Cengage Leaming Fig.9-3,p.179
19 Fig. 9-3, p. 179
Difference Species:All human being Population:Black,white,yellow Cantonese,Pekinese 20
20 Difference Species: All human being Population: Black, white, yellow Cantonese, Pekinese