Question

12．Every day，people come into contact with thousands of chemicals．These chemicals are said to be harmless to human health．In fact，the chemicals are considered so safe that we wash with them．We put them on our bodies and even our faces．Other chemical products are used throughout our homes．
By the time you walk out of your front door，you have already been exposed to thousands of chemicals．
On its own，each chemical seems harmless．But in combination with other chemicals，they may become deadly．That is the finding of a two-year study by a high-profile（高调的）task force of scientists．The task force was told to investigate the cancer-causing possibility of chemical mixtures．
Linda Gulliver was one of the 174 scientists on the task force．Their job was to study the cancer-causing potential of 85 chemicals．All 85 are said to be common in the environment．
Ms．Gulliver explains that chemicals have the potential or ability to form dangerous mixtures．Even simple minerals can become dangerous when mixed with chemicals found in plastics or beauty products．
Working in groups，the scientists explored how different chemical mixtures could lead to cancer．Ms．Gulliver's team looked at the ability of different combinations to support the increase of malignant（恶性的）human cells．
She says the current way to identify whether chemicals cause cancer is to test them one at a time．This method leads，she adds，to a long list of supposedly"safe"chemicals．She and her team say that approach needs to change．
"We definitely need certain research…to find out what mixtures of chemicals would be more harmful than others； what groups of chemicals，when together，would produce more harmful effects．And at the moment，that is not known．"
An estimated one in five cancers has been linked to chemical exposure．It may turn out that the cancer-causing villain（恶棍）is not a single chemical at all．

32．What effect may one single chemical have on us according to the text？B
A．It may destroy our body．
B．It may not cause danger to us．
C．It may let us suffer from cancer．
D．It may let our body make a change．
33．What can we learn about Ms．Gulliver's research？D
A．She has found 85 cancer-causing chemicals．
B．She has found reasons for five kinds of cancers．
C．She has found that only one chemical can cause cancer．
D．She is not sure what mixtures of chemicals are more harmful．
34．According to the text，we can infer that the studyB．
A．is just wasting time and money
B．is still in need of great efforts
C．will cause panic in public
D．will be resisted by the public
35．What is the best title for the text？A
A．Mixtures of Safe Chemicals May Cause Cancer
B．Being Exposed to One Chemicals Is Dangerous
C．How Mixtures of Safe Chemicals Come into Being？
D．What Is the Real Cause For Cancer？

Answer 1

分析 短文主要讲了单一的化学物品可能对我们是无害的，但是如果与其他的化学物品混合在一起就可以导致癌症．

解答 32．B，细节理解题，根据句子 On its own，each chemical seems harmless可知单一的化学物品是对我们无害的，故答案为B．
33．D，推理判断题，根据句子what groups of chemicals，when together，would produce more harmful effects可知她不知道哪些化学物品混合在一起会更有害，故答案为D．
34．B，推理判断题，根据科学家所说的话And at the moment，that is not known．可知这个研究还需付出很大的努力，故答案为B．
35．A，主旨大意题，短文主要讲了单一的化学物品可能对我们是无害的，但是如果与其他的化学物品混合在一起就可以导致癌症，故最好的标题是"安全化学物品的混合可能会导致癌症"．

点评 解答任务型阅读理解题，首先对原文材料迅速浏览，掌握全文的主旨大意．因为阅读理解题一般没有标题，所以，速读全文，抓住中心主旨很有必要，在速读的过程中，应尽可能多地捕获信息材料．其次，细读题材，各个击破．掌握全文的大意之后，细细阅读每篇材料后的问题，弄清每题要求后，带着问题，再回到原文中去寻找、捕获有关信息．最后，要善于抓住每段的主题句，阅读时，要有较强的针对性．对于捕获到的信息，要做认真分析，仔细推敲，理解透彻，只有这样，针对题目要求，才能做到稳、准．