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A. deadly  B. tested    C . identified   D. activity    E. independently  F. resistance 

G. treat  H. lifelong    I. highly  J. seasonal

 

Evidence is increasing that common influenza viruses are becoming resistant to the main drug used to treat them. The drug is oseltamivir, also known as Tamiflu.

The most common ___41___ flu virus found in the United States this year is type A (H1N1). During the last flu season, twelve percent of H1N1 viruses ___42___ in the United States were resistant to Tamiflu. This year, researchers at the Centers for Disease Control and Prevention say ___43___ is close to 100 percent. Still, they say early reports show that flu___44___ has been low so far this year.

The research team is reporting its findings in the Journal of the American Medical Association. Alicia Fry led the team. Doctor Fry says it is better to prevent the flu than to have to ___45___ it. And the best form of prevention, she says, is getting vaccinated (进行预防接种) each year against influenza.

Viruses change, or mutate, (变异) so flu vaccines must be reformulated each year to target the most common threats.

But last week, two teams working ___46___ reported a discovery that could help lead to a universal flu vaccine. The hope is to develop a vaccine that could give ___47___ protection against a majority of flu viruses, including bird flu.

The scientists ___48___ a protein that inactivates the flu virus before it can mutate.

One team used an antibody found in blood donated by an individual. Scientist Ian Wilson at the Scripps Research Institute in California says the antibodies proved ___49 ___ effective in laboratory mice exposed to deadly levels of virus. He says they gave complete protection .

41. J 42. B 43. F 44. D 45. G 46. E 47. H 48. C 49. I

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Directions: Read the following text and choose the most suitable heading from A-F for each paragraphThere is one extra heading which you do not need.

A.Causes of overusing fluoride

B.Negative effects of fluoride

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1.

 

This question is answered by Dr Marcia M.Rich who practises general dentistry in Newholt.She is also a lecturer at the University and a writer for the monthly magazine Your Dentist Cares

2.

 

My answer to the first question is to stress that fluoride works well and is safe when users follow instructions.Young children have a tendency to swallow toothpaste, which is why they should only have a tiny amount of fluoride toothpaste on their toothbrush.If this simple measure is taken, parents can be confident that children will be protected against tooth decay, and come to no harm.

3.

 

Almost all medicines have an adverse effect-or even be deadly-if they are not taken as directed.So you are right-fluoride can be poisonous if it is swallowed in very large quantities.It is for the reason that fluoride supplements can only be obtained on prescription from the doctor or dentist.Please be assured that fluoride overdoses are rare-in fact, I have never heard of any fatal incidents related to fluoride poisoning.

4.

 

Scientific studies have shown that fluoride can help to prevent cavities as long as it is used correctly.If fluoride is abused, there is a risk of illness or even deaths in extreme cases.If a deadly amount of fluoride is taken, immediate first-aid could save a life.A person who has swallowed a large amount of fluoride will probably start vomiting.If not, the patient should be given milk or antacid and taken to the nearest hospital for emergency treatment.

5.

 

Taking too much fluoride while teeth are growing can lead to a condition called dental fluorosis.The most likely cause is the swallowing of fluoride toothpastes by young children.It can also be caused by inappropriate use of fluoride drop or other fluoride supplements, for example when fluoride is already is already present in drinking water.  

 

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