[填空题]Many workers who worked in the World Trade Center after the September eleventh attacks became sick. They breathed a mix of dust, smoke and chemicals in the ruins of the Twin Towers and a third building that fell. Some went clays without good protection for their (36) . Five years later, many of the thousands who worked at Ground Zero in the early days after the attacks still have health problems.
Doctors at Mount Sinai Medical Center in New York City have (37) the results of the largest study of these workers. The study (38) high rates of breathing problems in members of the building traders, firefighters, police officers and other workers. Almost seventy percent of the workers in the study had a new or worsened breathing problem. These problems developed during or after their time working in the mountain of (39) . About sixty percent still had breathing problems at the time of their (40) . The researchers say they decided to s

[填空题]Many workers who worked in the World Trade Center after the September eleventh attacks became sick. They breathed a mix of dust, smoke and chemicals in the ruins of the Twin Towers and a third building that fell. Some went clays without good protection for their (36) . Five years later, many of the thousands who worked at Ground Zero in the early days after the attacks still have health problems.
Doctors at Mount Sinai Medical Center in New York City have (37) the results of the largest study of these workers. The study (38) high rates of breathing problems in members of the building traders, firefighters, police officers and other workers. Almost seventy percent of the workers in the study had a new or worsened breathing problem. These problems developed during or after their time working in the mountain of (39) . About sixty percent still had breathing problems at the time of their (40) . The researchers say they decided to s

[单项选择]
What does the World Trade Center look like now

[单项选择]The attack of the World Trade Center will leave a （） impression on those who have witnessed the explosion.
A. long
B. forever
C. lasting
D. lively

[填空题]It (know)（　）to all that the World Trade Center in New York is the highest building in the city.

[单项选择]The tower of the World Trade Center ______ after it was hit by the plane.
A. dissipated
B. paddled
C. hedged
D. conapsed

[填空题]It (know)（）to all that the World Trade Center in New York is the highest building in the city.

[填空题]It (know)______to all that the World Trade Center in New York is the highest building in the city.

[填空题] The World Health Organization (WHO) says as many as 10 (36) _______persons worldwide may have the virus (病毒) that (37) _______ AIDS. Experts believe about 350-thousand persons have the (38) _________. And one million more may get it in the next five years. In the US, about 50,000 persons have died with AIDS. The country’’s top (39) _______ official says more than 90 percent of all Americans who had the AIDS virus five years ago are dead. There is no (40) _________ for AIDS and no vaccine (疫苗) medicine to prevent it. However, researchers know much more about AIDS than they did just a few years ago. We now know that AIDS is caused by a virus. The virus invades healthy cells, including white blood cells that are part of our (41) ________ system against disease. It takes control of the healthy cell’’s genetic material and forces the cell to make a copy of the virus. The cell then dies. And the viral particles move on to (42) ________ and kill more healthy cells. The AIDS viru