2015年职称英语理工B级阅读理解答案及解析
以下是关于2015年职称英语理工B阅读理解答案及解析，供同学们参考。
第四部分：阅读理解
阅读理解第一篇
Dangers Await Babies with Altitude
Women who live in the world’s highest communities tend to give birth to under-weight babies, a new study suggests. These babies may grow into adults with a high risk of heart disease and strokes.1 Research has hinted that newborns in mountain communities are lighter than average. But it wasn’t clear whether this is due to reduced oxygen levels at high altitude or because their mothers are under-nourished — many people who live at high altitudes are relatively poor compared with those living lower down. To find out more, Dino Giussani and his team at Cambridge University studied the records of 400 births in Bolivia during 1997 and 1998. The babies were born in both rich and poor areas of two cities: La Paz and Santa Cruz. La Paz is the highest city in the world, at 3.65 kilometers above sea level, while Santa Cruz is much lower, at 0.44 kilometers.
Sure enough, Giussani found that the average birth weight of babies in La Paz was significantly lower than in Santa Cruz. This was true in both high and low-income families. Even babies born to poor families in Santa Cruz were heavier on average than babies born to wealthy families in lofty La Paz. “We were very surprised by this result,” says Giussani. The results suggest that babies born at high altitude are deprived of2 oxygen before birth. “This may trigger the release or suppression of hormones that regulate growth of the unborn child.3 ‘‘ says Giussani.
His team also found that high-altitude babies tended to have relatively larger heads compared with their bodies4. This is probably because a fetus starved of oxygen will send oxygenated blood to the brain in preference to the rest of the body5.
阅读理解第二篇
Why Buy Shade-Grown Coffee?
When people argue about whether coffee is good for health, they’re usually thinking of the health of the coffee drinker. Is it good for your heart? Does it increase blood pressure? Does it help you concentrate? However, coffee affects the health of the human population in other ways, too.
Traditionally, coffee bushes were planted under the canopy(树冠) of taller indigenous(土生土长的) trees. However, more and more farmers in Latin America are deforesting the land to grow full-sun coffees. At first, this increases production because more coffee bushes can be planted if there aren’t any trees. With increased production come increased profits.
Unfortunately, deforesting for coffee production immediately decreases local wildlife habitat. Native birds nest and hide from predators(捕食者) in the tall trees and migrating birds rest there.
Furthermore, in the long term, the full-sun method also damages the ecosystem because more chemical fertilizers and pesticides are needed to grow the coffee. The fertilizers and pesticides kill insects that eat the coffee plants, but them the birds eat the poisoned insects and also die. The chemicals kill or sicken other animals as well, and can even enter the water that people will eventually drink.
Fortunately, farmers in Central and South America are beginning to grow more coffee bushes in the shade. We can support these farmers by buying coffee with such labels as “shade grown” and “bird friendly.” Sure, these varieties might cost a little more. But we’re paying for the health of the birds, the land, ourselves, and the planet. I think it’s worth it.
阅读理解第三篇
More Rural Research Is Needed
1 Agricultural research funding is vital if the world is to feed itself better than it does now. Dr. Tony Fischer, crop scientist, said demand was growing at 2.5% per year, but with modern technologies and the development of new ones, the world should be able to stay ahead1。
2 “The global decline in investment in international agricultural research must be reversed if significant progress is to be made towards reducing malnutrition and poverty,” he said.
3 Research is needed to solve food production, land degradation2 and environmental problems. Secure local food supplies3 led to economic growth which, in turn, slowed population growth. Dr. Fischer painted a picture of the world’s ability to feed itself in the first 25 years, when the world’s population is expected to rise from 5.8 to 8 billion people. He said that things will probably hold or improve4 but there’ll still be a lot of hungry people. The biggest concentration of poor and hungry people would be in sub-Saharan Afiica and southern Asia in 2020, similar to the current pattern. If there is any change, a slight improvement will be seen in southern Asia, but not in sub-Saharan Afiica. The major inqjrovement will be in East Asia, South America and South-East Asia.
4 The developing world was investing about 0.5%, or $8 billion a year, of its agricultural gross domestic product(GDP)on5 research, and the developed world was spending 2.5% of its GDP. Dr. Fischer said more was needed from all countries.
5 He said crop research could produce technologies that spread across many countries, such as wheat production research having spin-offs for Mexico, China or India6.
6 “Technologies still need to be refined for the local conditions but a lot of the strategic research can have global application, so that money can be used very efficiently,” Dr. Fischer said.