题目内容
（请给出正确答案）
Fifty years ago, more than 75 percent of all adult women in the U.S. had no jobs.
A．Y
B．N
C．NG
简答题官方参考答案
（由简答题聘请的专业题库老师提供的解答）
更多“Fifty years ago, more than 75 percent of all adult women in the U.S. had no jobs.A．YB．NC．N”相关的问题
Fifty years ago, wealthy people liked bunting wild animals for fun ________ sightseeing.
A．than to go
B．rather than to go
C．more than going
D．other than going
A.Fifteen years ago
B.Fifty years ago
C.Seventy years ago
D.Eighty years ago
Fifty years ago, wealthy people liked hunting wild animals for fun______sightseeing.
A．than to go
B．rather than to go
C．more than going
D．other than going
Fifty years ago, wealthy people liked hunting wild animals for fun ____________ (胜过四处观光)
It is implied that fifty years ago
A．American working people were employed only in factories
B．the majority of American intellectuals were employees
C．the percentage of intellectuals employed was almost the same as that of ordinary workers
D．most employees were less formally educated
Why does the author mention the meteorite ALH84001 in paragraph 6？
A．Because it was found in Antarctica about fifty years ago
B．Because it was evidence of a recent impact on Mars
C．Because scientists thought that it contained evidence of life on Mars
D．Because the meteorite probably came from Mars a long time ago
听力原文： It was not until one hundred and fifty years ago that scientists learned about the existence of dinosaurs. Thanks to an English doctor and his wife, the door was opened to this zoological study. Reasoning that these animals' tremendous size must have made them terrible creatures, scientists combined two Greek words, deimos, meaning terrible, and sauros, meaning lizards, to form. the word dinosaur.
After many years of study, they determined that these beasts roamed the earth for millions of years, and ceased to exist some sixty million years ago.
Unbelievable as it may seem, not all dinosaurs were carnivorous, that is, meat eating. Many were herbivorous, or vegetarians.
By reassembling the bones found at digging sites, scientists have been able to reconstruct the skeletons and learn great deal about the dinosaur's living conditions. They have learned that dinosaurs inhabited not only the land, but also the water and sky.
(33)
A．Beasts.
B．Herbivorous.
C．Carnivorous.
D．Dinosaurs.
(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.
警告：系统检测到您的账号存在安全风险
为了保护您的账号安全，请在“简答题”公众号进行验证，点击“官网服务”-“账号验证”后输入验证码“”完成验证，验证成功后方可继续查看答案！
