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?
8.Four simple ways to stay positive
Trying to stay positive,both in good times and bad,is a great way to improve your quality of life.Try these four methods on a daily basis.
1.Don't think a lot about negativity.
Of course.Staying positive 24 hours a day,seven days a week is a bit difficult.Letting things get to you is normal,and it's actually healthy to cry or express frustrations once in a while.
It's when those negative moments control your life that your emotional balance is at risk.(36)F However,don't give that sadness another second in your day.
2.(37)A
What you put into your body directly affects how you feel on the outside.Fill yourself with good,healthy foods like fruits and vegetables and limit snacking.Exercise is equally of great importance.Take a few days out of your week for at least a half a hour of activity,and try to stick to a routine.(38)G 
3.Be kind to others.
(39)EMaking someone's day a bit brighter not only puts a smile on his or her face.but also yours as well.Remember to smile and treat each person with pity and respect.Good deeds are contagious (传染的),and your positive attitude may spread among others.
4.Take it one day at a time.
Being positive isn't an instant thing.It's a steady effort that we follow every hour of every day.(40)C Instead,focus on living in the moment and doing what you can to make each moment better.

A.Eat healthy and stay fit.
B.Take your lunch breaks outside.
C.Don't worry about what the future may bring.
D.Gratefulness helps you appreciate life in bad times.
E.Good feelings come from acts of kindness and selflessness.
F.Take a few minutes to feel sad and accept what happened.
G.Even going outside for a walk and enjoying the sunshine improves your mood.
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