概要：Rainforests like the Amazon are important for mopping up CO2 from the atmosphere and helping to slow global warming. Currently the trees in the Amazon take in around 500 million tones of CO2 each year; equal to the total amount of CO2 giving off in the UK each year. But how will the Amazon react to future climate change? If it gets drier, will it still survive and continue to draw down CO2? Scientists hope that they will be able to learn in advance how the rainfores
Rainforests like the Amazon are important for mopping up CO2 from the atmosphere and helping to slow global warming. Currently the trees in the Amazon take in around 500 million tones of CO2 each year; equal to the total amount of CO2 giving off in the UK each year. But how will the Amazon react to future climate change? If it gets drier, will it still survive and continue to draw down CO2? Scientists hope that they will be able to learn in advance how the rainforest will manage in the future by understanding how rainforests reacted to climate change in the past.
Unfortunately, getting into the Amazon rainforest and collecting information are very difficult. To study past climate, scientists need to look at fossilized pollen, kept in lake muds. Going back to the last ice age means drilling deep down into lake sediments（沉淀物）, which requires specialized equipment and heavy machinery. There are very few roads and paths, or places to land helicopters and aeroplanes. Rivers tend to be the easiest way to enter the forest ,but this still leaves vast areas between the rivers completely unsampled（未取样）. So far, only a handful of cores have been drilled that go back to the last ice age and none of them provide enough information to prove how the Amazon rainforest reacts to climate change.
67．The best title for this passage may probably be .
A．Studies of the Amazon B．Climates of the Amazon
C．Secrets of the Rainforests D．Changes of the Rainforests
【实战演练练习七】（05 上海卷 D 篇）
Equipped only with a pair of binoculars(双筒望远镜) and ready to spend long hours waiting in all weathers for a precious glance of a rare bullfinch(红腹灰雀). Britain’s birdwatchers had long been supposed to be lovers of a minority sport. But new figures show birdwatching is fast becoming a popular pastime, with almost three million of us absorbed in our fluttering feathered friends.
Devoted birdwatchers, those prepared to travel thousands of miles for a sighting of a rare Siberian bird are fast being joined by a new breed of follower whose interest is satiated by watching a few finches(雀科鸣鸟) on a Sunday walk or putting up a bird-box in the back garden.
“Almost three million UK birdwatchers is certainly possible if you include everyone with only a casual interest.” Stephen Moss said in his newly published book－A Bird in the Bush a Social History of Birdwatching－which records the pursuit from the rich Victorian Englishman’s love of shooting rare birds to the less offensive observational tendencies of birdwatchers today.
Television wildlife programmes have helped to fuel the new trend. Last summer, BBC 2’s Britain Goes Wild was a surprise success .It pulled in three million viewers and led to bird-houses selling out across the UK as 45,000 people promised to put up a box.
Birdwatchers’ networking system first came to the attention of the nation in 1989, when a birdwatcher caught sight of the first Vermivora chrysoptera --- a golden–winged songbird from North America－to be seen in Britain. He put a message our on the network service Birdline, and the next day 3,000 birdwatchers proved the fell pull of a truly rare bird as they visited the Tesco car park in Kent, where it had settled. Today, birdwatchers can log on to www.birdline.co.uk or have news of the latest sightings texted to their phones. www.85jc.com
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