next 30 years as the population of Asia increases to an estimated 5,000 million people.
Keys:1.D 2.B 3.A 4.C 5.C
Task3: Mountain regions face a number of dangers
Script
Mountain people around the world are in great danger of the negative effects of the worsening environment, according to a UN report.
As global warming and deforestation accelerate and technology makes wilder places more accessible, environmental and social pressures on the world's remotest regions increase.
The UN has found that many mountainous regions—inhabited by one out of five of the world's people—are barely recognizable when they are compared to what they were like 60 years ago.
This is mostly because forests were cut to make way for cattle grazing and agriculture.
The authors of the UN study expect 98 percent of the mountain areas to experience severe climate change by 2055.
Biological losses are expected to be heavy.
The mountains of Europe, parts of California and the northwest Andes in South America are among the most threatened mountain areas in the world and should be given priority in conservation.