[填空题]There is agreement among linguists who have considered the
situation over half of the world’s languages are moribund, (1)
i.e. effectively being passed on to the next generation. We and our (2)
children, then, are living in the point in human history where, (3)
within perhaps two generations, most languages in the world will die out.
This mass extinction of languages may not appear immediate (4)
life-threatening. Some will feel that a reduction in numbers of languages
will ease communication, and perhaps helps build nations, even global (5)
solidarity. But there has been well pointed out that the success of humanity (6)
in colonizing the planet has been due to our ability to develop
cultures suit for survival in a variety of environments. These (7)

[填空题]There is agreement among linguists who have considered the
situation over half of the world’s languages are moribund, (1)
i.e. effectively being passed on to the next generation. We and our (2)
children, then, are living in the point in human history where, (3)
within perhaps two generations, most languages in the world will die out.
This mass extinction of languages may not appear immediate (4)
life-threatening. Some will feel that a reduction in numbers of languages
will ease communication, and perhaps helps build nations, even global (5)
solidarity. But there has been well pointed out that the success of humanity (6)
in colonizing the planet has been due to our ability to develop
cultures suit for survival in a variety of environments. These (7)

[填空题]There is much bitter feeling among those who, deprived of their social security benefits, queued at an eating hall and registered for jobs available.

[单项选择]It has become a cliche among doctors who deal with AIDS that the only way to stop the epidemic is to develop a vaccine against HIV, the virus that causes it. Unfortunately, there is no sign of such a thing becoming available soon. The best hope was withdrawn from trials just over a year ago amid fears that it might actually be making things worse. As a result, vaccine researchers have mostly gone back to the drawing board of basic research. Meanwhile, the virus marches on. Last year, according to UNAIDS, the international body charged with combating it, 2.7 million people were infected, bringing the estimated total to 33 million.
Reuben Granich and his colleagues at the World Health Organization (WHO), though, have been exploring an alternative approach. Instead of a vaccine, they wonder, as they write in The Lancet, whether the job might be done with drugs.
In the spread of any contagious disease, each act of infection has two parties, one who already has the disease and
A. They use data from some African countries and other poor countries.
B. They want to find out whether the alternative approach can function.
C. The first-line antiretroviral drugs are effective in curing patients.
D. Their study is to let the patients have no symptoms of AIDs.

[单项选择]Among ten sales people who started their business at the same time, Mr. Rayburn was the only successful one, because he was the
A. luckiest.
B. most qualified.
C. most hard-working.

[填空题]To judge how serious a flood is, we have to consider the volumes of rivers and streams in an area and ______.