Fifty million Americans are addicted（) nicotine.A toB atC inD on

e bees' crushed bodies can better prevent serious and sometimes fatal sting reactions in the more than one million Americans who are hypersensitive to bee stings. The crushed-body treatment has been standard for fifty years, but a report released recently said that it was ineffective. The serum made from the crushed bodies of bees produced more adverse reactions than the injections of the venom did.

The research compared results of the crushed-body treatment with results of immunotherapy that used insect venom and also with results of a placebo. After six to ten weeks of immunization, allergic reactions to stings occurred in seven of twelve patients treated with the placebo, seven of twelve treated with crushed body extract, and one of eighteen treated with the venom.

The word "fatal" in paragraph 1, sentence 1 is closest in meaning to ______.

A．harmful

B．lethal

C．painful

D．disease-causing

(判断)AIDS, fifty years ago, didn’t exist.Fifteen years ago a few doctors and public health officials noticed the first cases.Within a few years it was clear that it has now killed almost 14 million people around the world.

Four years ago doctors came up with the first treatment to make a dent in the spiraling death rate.Today that treatment works for some patients, but it’s not clear how long results will last.And still there is no cure.

For the nearly 35 million people around the world now living with HIV, there may never be a cure.Once cells are infected with HIV, it is very difficult — perhaps impossible ―to rid them of the virus.The only sure way to stop AIDS is to prevent infection in the first place, and only a vaccine can do that.

Unfortunately HIV is one of the most changeable viruses known to science.After more than a dozen years, it is still rather difficult to produce effective vaccine.

Still the billions of dollars spent on AIDS research over the past 20 years has not been wasted.As scientists learn more about how HIV survives in the human body, they are realizing that drugs alone may not be enough.To contain the virus effectively, it may take a balance between drug treatments that can keep HIV levels low and a strengthened immune system that can then target and destroy the remaining virus.Until scientists find a vaccine, however, they may control but never cure the century’s final scourge.

46.AIDS didn’t exist fifteen years ago.

47.Scientists have found a vaccine which can prevent HIV infection.

48.Although some treatment works for some patients with HIV, there is still no cure.

49.HIV is a changeable virus so that it is very difficult to produce effective vaccine.

50.We have wasted billions of dollars on AIDS research.

A.Fast food is not the invention of American peopl

B.Drive-through windows allow people to order and eat food right in their cars.

C.McDonald’s was the first fast food restaurant set up in Americ

D.White Castle is a hamburger joint that opened in 1916.

From the first paragraph, we learn that ______.

A. the number of prisoners in America is increasing

B. America has the largest prison in the world

C. crime in America is getting much more serious

D. it is easy for a person to be locked up in America

A.A.To give best wishes for the coming Christmas and New Year.

B.B.To ask for the introduction of some business partners in North Americ

C.C.To consolidate the business relationship.

A.He was the 16th president of Americ

B.He was killed in 1865 when the Civil War was just finishe

C.He was a businessman and then became politician.

D.He was born in a poor farm family.

A.It is in the Atlantic Ocean.

B.There are 8 main islands.

C.It is the 50th states of Americ

D.America took over Hawaii government from the local kin

All Americans are at least vaguely (1)_____ with the (2)_____ of the American Indian. Cutbacks in federal programs for Indians have made their problems (3)_____ more severe in recent years. Josephy reports," (4)_____ 1981 it was estimated that cut, backs in federal programs for Indians totaled about $500 million" (5)_____ mole than ten times the cuts affecting their (6)_____ fellow Americans. This reduced funding is affecting almost all aspects of reservation life, (7)_____ education. If the Indians could solve their (8)_____ problems, solutions to many of their other problems might not be far behind. In, this paper the current status of Indian education will be described and (9)_____ and some ways of improving this education will be proposed.

Whether to (10)_____ with the dominant American culture or to (11)_____ Indian culture has been a longstanding issue in Indian education. The next fifty years became a period of (12)_____ assimilation in all areas of Indian culture, but especially in religion and education.

John Collier, a reformer who agitated. (13)_____ Indians and their culture from the early 1920s until his death in 1968, had a different idea. He believed that instead of effacing native culture, Indian schools (14)_____ encourage and (15)_____ it.

Pressure to assimilate remains a potent force today, (16)_____. More and more Indians are graduating from high school and college and becoming (17)_____ for jobs in the non-Indian society." When Indians obtain the requisite skills, many of them enter the broader American society and succeed." (18)_____ approximately 90 percent of all Indian children are educated in state public school systems (Taylor 136, 155). (19)_____ these children compete with the members of the dominant society, however, is another (20)_____.

A．agreeable

B．regardless

C．familiar

D．sympathetic

Which of the following is NOT true according to the last paragraph？（）

[A] America will conduct an international-wide aid.

[B] The national-wide financial aid is proved helpful.

[C] Obama doesn't think highly of American aid system.

[D] Mr. Sumner's research is proved of great value.

Which of the following best summarizes the U. S. economic situation today？

［A］American economists are painting a gloomy picture.

［B］It is slowly warming up with moderate growth.

［C］Recession may come back anytime in the coming months.

［D］Most sectors are picking up at a surprisingly fast pace.