31 According to the passage, what is the recent Alzheimer’s research mainly about?
(A)Why women live longer than men.
(B)Why women are more prone to Alzheimer’s.
(C)How Alzheimer’s treatments were discovered by women.
(D)How Alzheimer’s influences the lives of many Americans.

Years ago, many scientists assumed that a woman’s heart worked pretty much the same as a man’s.

But as more women entered the male dominated男性為主 field of cardiology心臟病學, many such assumptions假定 vanished消失, opening the way for new approaches to research and treatment.

A similar shift is underway in the study of Alzheimer's阿茲海默症 disease.

It has long been known that more women than men get the deadly neurodegenerative神經組織退化的 disease, and an emerging body of research is challenging the common wisdom as to why.

Although the question is by no means一點都不 settled同意、解決, recent findings suggest that biological, genetic and even cultural influences may play heavy roles.

Of the more than 5 million people in the United States who have been  diagnosed診斷（病症）with Alzheimer’s, the leading cause of dementia（尤指老年性）癡呆, two-thirds are women.

Because advancing age is considered the biggest risk factor for the disease, researchers largely have attributed屬性 that disparity（不公平的）差異 to women’s longer life spans跨距, 范围.

The average life expectancy（對令人激動或愉快的事情的）期待，渴望 for women is 81 years, compared with 76 for men.

And even after taking age into account, women are more at risk. With the number of Alzheimer’s cases in the United States expected to more than triple三部分；發生三次, 三倍 by 2050, there is a greater need to understand the underlying暗含的；深層 reasons women are more prone有…傾向的, 躺下 to the disease and to develop gender-specific特有 treatments.

The area of inquiry問題 has been growing in part because of a push by female Alzheimer’s researchers, who have formed a group to advocate擁護；支持；提倡 for a larger leadership role in the field and more gender-specific特有 research.