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The students were______the prospect of having to do their projects all over again.
A．faced with
B．charged with
C．related to
D．accustomed to
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Bringing Nanotechnology to Health Care for the Poor
Nanotechnology uses matter at the level of molecules and atoms. Researchers are finding different uses for particles with a length of one nanomcter, or one-billionth of a meter, These include things like beauty products and dirt-resistant clothing. But one area where many experts believe nanotechnology holds great promise is medicine.
Last week, speakers at a program in Washington discussed using nanotechnology to improve health care in developing countries. The program took place at the Woodrow Wilson International Center for Scholars. Peter Singer at the University of Toronto says a nanotechnology called quantum dots could be used to confirm cases of malaria. He says it could offer a better way than the traditional process of looking at a person&39;s blood under a microscope.
In poor countries, this process is often not followed. As a result, sick people may get treated for malaria even if they do not have it. Such misuse of medicines can lead to drug resistance.
Quantum dots are particles that give off light when activated. Researchers are studying ways to program them to identify diseases by lighting up in the presence of a targeted molecule.
Experts say nanotechnology shows promise not just for diagnosing diseases, but also for treating them. Piotr Grodzinski of the National Institutes of Health talked about how nanotechnology could make drugs more effective. He talked about cancer drugs already developed with nanotechnology. He says if a drug can target a cancer locally in the body, then much less of it might be needed, and that means lower side effects.
Andrew Maynard is chief scientist for the Project on Emerging Nanotechnologies at the Woodrow Wilson Center. He noted that Brazil, India, China and South Africa are currently doing nanotechnology research that could help poor countries. But he also noted that there is some risk in using nano-materials. He says nanometer-sized particles behave differently in the body and the environment compared to larger particles. Experts say more investment in research is needed to better understand these risks.
Which of the following uses ofnanotechnology is NOT mentioned in the passage？ 查看材料
A.make beauty products and dirt-resistant clothing
B.To produce better and lighter building materials
C.help more accurately diagnose diseases
D.To help more effectively treat diseases
Regular exercise can help you build stronger muscles, shake off illnesses？and make your clothes fit a whole lot better. But there’sanother benefit:even moderate exercise www.docin.com 10 seems to take years off your age. Of course, you cant change your age, but exercise can improve your health so that you look and feel younger than you are.
Exercise gives you more energy. Exercise fires up your brain and body so you feel more energetic.
Exercise puts your body in a state of excitement,which means more vitality and a greater sense of well being. Daily tasks become less tiring and require less effort. It’s the kind of energy that makes you feel like you are a decade or two younger.
Exercise keeps your skin soft and glowing. Researchers studied a small group of adults between ages 20and 84. The frequent exercisers who were over age 40had skin that resembled the younger skin of people in their 20s and 30s. The difference had nothing to do with sun exposure, which would age your skin faster, reported the research team, they guess that exercise creates body substances that help slow aging in skin, though they say more research is needed to learn how exercise works.
Moreover,exercise helps you sleep soundly. Restful sleep is like a fountain of youth, and exercise helps you achieve it. Research shows that regular exercisers fall asleep more easily and are more likely to 7experience deep sleep. Exercise tires you out,sure,but there’s v more to it than that. Sleeping well helps all the systems in your body function optimally,so d you’re less likely to suffer sleeplessness. A recent study finds that getting at least 150minutes of exercise per week improves sleep quality by 65%.
28.What do we know about sun exposure according to the passage？
A.It leads to faster aging in skin
B.It encourages more exercise
C.It makes the exerciser sweat
D.It creates body substances
What can we learn from Para, 3？ A.The researchers think exercise helps the skin work faster
B.The researchers are not sure how exercise works on skin
C.Exercise brings more sun exposure to the skin
D.Exercise only works on people under 40
How does exercise affect people’s sleep？ A.It improves sleep quality
B.It increases the length of sleep
C.It helps people sleep regularly
D.It makes people less tired in sleep
Which would be the best title of the passage？ A.Exercise and Sounder Sleep
B.Exercise and Stronger Muscles
C.Exercise Increases Sun Exposure
D.Exercise Makes You Look Younger
A、Section 1 - Conversation in an everyday social context
B、Section 2 - Monologue in an everyday social context
C、Section 3 - Conversation in an educational context
D、Section 4 - Monologue in an educational context
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