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READING PASSAGE 1 California’s age of Megafires A) There’s a reason fire squads now battling more than a dozen blazes in southern California are having such difficulty containing the flames, despite better preparedness than ever and decades of experience fighting fires fanned by the notorious Santa Ana winds. The wildfires themselves, experts say, generally are hotter, move faster, and spread more erratically than in the past. B) The short-term explanation is that the region, which usually has dry summers, has had nine inches less rain than normal this year. Longer-term, climate change across the West is leading to hotter days…

READING PASSAGE 1 LONGAEVA: Ancient Bristlecone Pine A) To understand more about the earth’s history, humans have often looked to the natural environment for insight into the past. The bristlecone pine (Pinus longaeva), of the White Mountains in California, has served this purpose greater than any other species of tree on the planet. Conditions here are brutal: scant precipitation and low average temperatures mean a short growing season, only intensified by ferocious wind and mal-nutritious rocky. Nevertheless, bristlecone pines have claimed these barren slopes as their permanent home. Evolving here in this harsh environment, super-adapted and without much competition, bristlecones…

READING PASSAGE 1 LEISURE TIME IN AMERICA A) As most Americans will tell you if you can stop them long enough to ask, working people in the United States are as busy as ever. Sure, technology and competition are boosting the economy; but nearly everyone thinks they have increased the demands on people at home and in the workplace. But is the overworked American a creature of myth? B) A pair of economists have looked closely at how Americans actually spend their time. Mark Aguiar, at the Federal Reserve Bank of Boston and Erik Hurst, at the University of Chicago’s…

READING PASSAGE 1 Bamboo, A Wonder Plant The wonder plant with an uncertain future: more than a billion people rely on bamboo for either their shelter or income, while many endangered species depend on it for their survival. Despite its apparent abundance, a new report says that species of bamboo may be under serious threat. A) Every year, during the rainy season, the mountain gorillas of Central Africa migrate to the foothills and lower slopes of the Virunga Mountains to graze on bamboo. For the 650 or so that remain in the wild, it’s a vital food source. Although they…

READING PASSAGE 1 Dirty river but clean water Floods can occur in rivers when the flow rate exceeds the capacity of the river channel, particularly at bends or meanders in the waterway. Floods often cause damage to homes and businesses if they are in the natural flood plains of rivers. While riverine flood damage can be eliminated by moving away from rivers and other bodies of water, people have traditionally lived and worked by rivers because the land is usually flat and fertile and because rivers provide easy travel and access to commerce and industry. A) FIRE and flood are…

READING PASSAGE 1 Learning By Examples A) Learning theory is rooted in the work of Ivan Pavlov, the famous scientist who discovered and documented the principles governing how animals (humans included) learn in the 1900s. two basic kinds of learning or conditioning occur, one of which is famously known as the classical condition. Classical conditioning happens when an animal learns to associate a neutral stimulus (signal) with a stimulus that has intrinsic meaning based on how closely in time the two stimuli are presented. The classic example of classical conditioning is a dog’s ability to associate the sound of a…

READING PASSAGE 1 Food for thought 2 A) There are not enough classrooms at the Msekeni primary school, so half the lessons take place in the shade of yellow-blossomed acacia trees. Given this shortage, it might seem odd that one of the school’s purpose-built classrooms has been emptied of pupils and turned into a storeroom for sacks of grain. But it makes sense. Food matters more than shelter. B) Msekeni is in one of the poorer parts of Malawi, a landlocked southern African country of exceptional beauty and great poverty. No war lays waste Malawi, nor is the land unusually…

READING PASSAGE 1 Section A decibel Hell: It’s not difficult for a person to encounter sound at levels that can cause adverse health effects. During a single day, people living in a typical urban environment can experience a wide range of sounds in many locations, even once-quiet locales have become polluted with noise. In fact, it’s difficult today to escape sound completely. In its 1999 Guidelines for Community Noise, the World Health Organization (WHO) declared, “Worldwide, noise-induced hearing impairment is the most prevalent irreversible occupational hazard, and it is estimated that 120 million people worldwide have disabling hearing difficulties.” Growing evidence also…

READING PASSAGE 1 Copy your neighbour A) THERE’S no animal that symbolises rainforest diversity quite as spectacularly as the tropical butterfly. Anyone lucky enough to see these creatures flitting between patches of sunlight cannot fail to be impressed by the variety of their patterns. But why do they display such colourful exuberance? Until recently, this was almost as pertinent a question as it had been when the 19th-century naturalists, armed only with butterfly nets and insatiable curiosity, battle through the rainforests. These early explorers soon realised that although some of the butterflies’ bright colours are there to attract a mate,…

READING PASSAGE 1 Natural Pesticide in India A) A dramatic story about cotton farmers in India shows how destructive pesticides can be for people and the environment; and why today’s agriculture is so dependent on pesticides. This story also shows that it’s possible to stop using chemical pesticides without losing a crop to ravaging insects, and it explains how to do it. B) The story began about 30 years ago, a handful of families migrated from the Guntur district of Andhra Pradesh, southeast India, into Punukula, a community of around 900 people farming plots of between two and 10 acres.…