高级英语视听说第五单元文本
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Unit 5(key)
F
T
T
T
T
F
Naturally changing climate
Man’s doing
Expeditions
Ice cores
Fingerprint
Burning fossil fuels
Carbon dioxide
Thousand
Warm
nd of the great bear.
2.Polar bears’ health.
3.A tranquillizer dart.
4.Bear population there is the healthiest.
5.Changes in the bears’ fat, dimensions and teeth.
6.They can only hunt on the ice.
1.They say they’re no more reliable than the local weatherman.
2.They made science as precise as it is today.
3.The US can’t flip its energy use overnight and its economy night get
hurt.
4.His job is to tell the government exactly what he knows scientifically.