In the rich countries of the West, the electric vehicle revolution is well occurring. Climate-conscious consumers drive Teslas or Polestars for reasons of morality (道德) and fashion. Poorer countries are also experiencing a wave of electrified trend. In Bangladesh, electric three-wheeler taxis, known as tuk-tuks, are rapidly replacing gas-powered ones on the streets. Such electric vehicles are climate friendly, cost effective, and help reduce air pollution.
Yet a glance under the hood (引擎盖) of these vehicles shows a poisonous secret: each tuk-tuk runs on five massive lead-acid batteries (铅酸电池), containing almost 300 pounds of lead (铅) in total. Every year and a half or so, when those batteries need to be replaced and recycled, about 60 pounds of lead leaks into the environment. Battery recycling, often at small-scale unregulated factories, is a highly profitable (高利润的) but deadly business.
Lead is dangerous, and any exposure to it is harmful to human health. Lead that has entered the environment hurts people on an unexpected scale. The numerous ways lead enters air, water, soil, and homes across the developing world and the enormous damage it does to human health, wealth, and welfare cause one of the biggest environmental problems in the world yet receives little attention.
The World Bank estimates that lead kills 5.5 million people per year, making it a bigger global killer than AIDS, malaria, diabetes, and road traffic deaths combined. On top of the shocking deaths, the social burden of lead poisoning is heavy, as is its contribution to global inequality — our research on the cognitive (认知的) effects of lead poisoning suggests that it may explain about one-fifth of the educational achievement gap between rich and poor countries.
But unlike many challenges faced by developing countries, lead poisoning is a problem that can be resolved through financial investment (财政投入). Better monitoring, research, and rules can help protect children all over the world from the unpleasant effects of lead poisoning and reduce the massive global costs it brings.
【小题1】How does the author describe the lead problem in paragraph 2?| A．By listing some numbers. | B．By analyzing hidden causes. |
| C．By making an interesting comparison. | D．By explaining its working principle. |
| A．Lead enters poor countries in one way. |
| B．Lead leaking has been avoided in all the countries. |
| C．Lead will definitely not harm anymore. |
| D．Lead poisoning may make poor societies poorer. |
| A．Fixing these used batteries. | B．Reducing the cost of recycling lead. |
| C．Ignoring the illegal use of lead. | D．Putting certain effort and money. |
| A．The Impacts of Lead Poisoning on Man. |
| B．The Global Lead Poisoning Problem. |
| C．The Ways to Solve Lead Problem. |
| D．The Benefits of Using Electric Vehicles. |
