解析 主旨大意题。该篇从马克·吐温的人生经历,他的作品及其它作者的作品进行比对后,作者得出了:马克·吐温比与他同时代的作家更反对种族主义。
答案 A
Chemicals used for industrial processes often create dangerous forms of waste. The amount of these chemicals has risen heavily in the past few years, as more areas of the world industrialize and new products are produced. Over 80,000 different chemicals are used in industries world-wide. Around the world hundreds of millions of tons of harmful waste are produced each year. Often, it is difficult and expensive to get rid of these chemicals or to store them in a way that does not endanger human life and the environment.
Every year, major health problems result from harmful waste. Sadly, it is often after someone has died or, become seriously ill that governments will take actions and reduce levels of dumped(倾倒的)harmful waste. In 1989, a school in New Jersey had to be closed because students there had suffered too much exposure(暴露)to chromium(铬). It was later learned that large amounts of chromium had been dumped nearby and blown over to the school area.
Research has been done to provide information on the effects of every chemical. Because waste chemicals often mix together, it will also be necessary to learn how the combinations of these chemicals affect human health.
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