On June 5, 1981 the Centers for Disease Control in Atlanta, U.S. announced the presence of

On June 5, 1981 the Centers for Disease Control in Atlanta, U.S. announced the presence of a rare, infectious disease in five American homosexuals(同性恋). Soon doctors were finding similar cases all over the country and the world. The AIDS epidemic(流行病)had officially begun. By 1983 it was clear that AIDS had spread around the world. More than twenty years later, AIDS has left twenty-six million dead and another forty million infected. AIDS has become the worst medical disaster ever experienced by mankind.
Hundreds of young people between the ages of 20 and 45 died each week during the early years of the U.S. AIDS. More than 600,000 cases of AIDS have been reported since 1981 in the United States, and it is estimated that there may be as many as 900,000 Americans infected with HIV.
Though the rate of HIV infections continues to increase in the United States, the number of AIDS cases has fallen sharply since 1996, when antiretroviral drugs came onto the market. Unfortunately, the AIDS epidemic continues today in Africa and much of Asia, where antiretroviral treatment is not available and health care is far from enough. AIDS is the fourth leading cause of death worldwide, and the No. 1 cause of death due to infectious disease.
HIV, the virus that causes AIDS, was first separated in 1983 by a team at the Pasteur Institute in Paris. That discovery made it possible to develop a test for AIDS and trace back to victims who may have died before doctors were aware of the disease.
However, scientists still don't know exactly how and where AIDS started. Finding the source of AIDS could be important in developing a vaccine(疫苗) and be important in mapping the future course of the epidemic.
【小题1】It can be inferred from the passage that
A．antiretroviral drugs will be obtained easily all over the world
B．the best way to stop AIDS is to develop a vaccine
B．scientists will soon find a way to cure AIDS
D．there will be fewer AIDS cases in the world in the future
【小题2】Which areas are the most worrying places where AIDS spreads quickly? A．Africa.B．Asia.C．The United States.D．France.【小题3】The number of AIDS cases has greatly decreased in the United States due to the fact
A．a team at the Pasteur Institute in Paris succeeded in separating HIV
B．some effective medicine has been invented
B．scientists understand AIDS better and better.
D．The rate of HIV infections continue to rise in the United States
【小题4】What's the importance of the discovery of the source of AIDS?
A．It can be used to develop a test for AIDS.
B．It can stop HIV forming AIDS.
B．It can reduce the rate of death caused by AIDS.
D．It can help develop a drug to prevent AIDS.B

(答案→)B 解析：【小题1】从第三段的叙述中可知正确答案。【小题2】从第三段Unfortunately, the AIDS epidemic continues today in Africa and much of Asia, where antiretroviral treatment is not available and health care is far from enough.可知正确答案。【小题3】从第三段Though the rate of HIV infections continues to increase in the United States, the number of AIDS cases has fallen sharply since 1996, when antiretroviral drugs came onto the market.可知正确答案。【小题4】从最后一段Finding the source of AIDS could be important in developing a vaccine(疫苗) and be important in mapping the future course of the epidemic.可知正确答案。

收益了

我认为水曲柳好，木制的性体不同， 求采纳

白蜡木主要分布在俄罗斯北美和欧洲部分地区，木纹明显，线条鲜明，尤其是欧洲白蜡木木材坚固耐用，美丽和富有弹性的花纹以及光滑的切面和耐老化的特性非常适合用来做实木地板，白蜡木属于高端木材，大面积绚丽的花纹和生动的色泽在阳光的折射下显得愈发美丽动人，仿佛欧洲姑娘波浪般的头发，散着一股天生的欧洲浪漫情怀，柔和的触感更使得人们心神荡漾，令人神往。同时，白蜡木实木地板强大的实用性也为它带来了庞大的顾客群，因此白蜡木在现代简约风格中被运用的比较普遍。 红橡在美国是广泛使用的木材，用红橡木来制造家具时比较理想的，红橡比较突出的性能就是耐用性和物理性能，橡木结构粗，色泽淡雅，耐磨损。因此红橡实木地板体现的怀旧魅力，内敛和高贵典雅是毫无违和感的，贝亚克美国红橡实木地板就很好的体现了这一点，美国红橡木实木地板纹理比较柔和，淡雅的土黄色不经意间流露出一种田园生活的宁静气质和乡村的自然恬静。

如以上回答内容为低俗、色情、不良、暴力、侵权、涉及违法等信息，可以点下面链接进行举报！

点此我要举报以上问答信息