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Scientists have developed a new cancer drug. So far, they have tested it only in laboratory
animals. The drug is designed to enter and kill cancer cells, but not healthy cells.First, the drug
enters the cancer cells and stops their supply of blood. Then it releases poison to destroy the
cancer cells.
Researchers at the Massachusetts Institute of Technology(MIT) in Cambridge carried
out the study. The results appeared in Nature magazine. A school report called the drug an
"anticancer smart bomb".
Ram Sasisekharan is a professor at MIT. He says that his team had to solve three problems.
They had to find a way to destroy the blood vessels, then to prevent the growth of new ones.
But they also needed the blood vessels to supply chemicals to _________.
So, the researchers designed a two-part "nanocell". The cell is measured in nanometers(毫微米),
or one thousand millionth of a meter.
The scientists say thay that it was small enough to pass through the blood vessels of the cancer,
but it was too big to enter normal blood vessels. The surface of the nanocells also helped them to
avoid natural defenses.
The scientists designed the cell as a balloon inside a balloon. They filled the outer part with a
drug that caused the blood vessels to die. That cut off the blood supply and put the nanocells inside
the cancer. Then, the nanocells slowly released drugs to kill the cancer cells.
The team says that the treatment killed the cancer and avoided healthy cells better than other
treatments. Untreated mice with cancer survived for twenty days. The scientists say that mice with
the best current treatments lived for thirty days. In this study, they say that eighty percent of the mice
treated with the nanocells lived more than sixty-five days.
The scientists say that more studies are needed before the new drug can be tested in humans.
5. Please translate the underlined sentence in the eighth paragraph into Chinese
________________________________________________________________________
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Doctors say anger can be an extremely damaging, unless you learn how to deal with it. They warn
that anger can lead to heart disease, stomach problems, headaches, emotional problems and possibly
cancer.Anger is a normal emotion that we all feel from time to time, some people express anger openly
in a calm reasonable way. Others burst with anger, and scream and yell. But other people keep their
anger inside. They can not or will not express it. This is called ______________.
For years many doctors thought that repressing anger was more dangerous to a person's health than
expressing it. They said that when a person is angry, the brain release the same hormones(荷尔蒙). They
speed the heart rate, raise blood pressure, or sugar into the blood, etc. in general the person feels excited
and ready to act.
Some doctors say that both repressing and expressing anger can be dangerous. They believe that those who express anger violently may be likely to develop heart disease, and they believe that those who keep
their anger inside may face a greater danger of high blood pressure.
Doctors say the solution is learning how to deal with anger. They say the first step is to admit that you
are angry and to recognize the real cause of the anger, then decide if the cause is serious enough to get
angry about. If it is, they say, "Do not express your anger while angry. Wait until your anger has cooled
down and you are able to express yourself calmly and reasonably."
Doctors say that a good way to deal with anger is to find humor in the situation that has made you
angry. They said that laughter is much healthier than anger.
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