英语听力精选进阶版 7241（在线收听）

美国的医生们说将来有可能通过人工方式来制造无数的卵子来帮助不孕妇女。研究人员发现当他们从妇女的卵巢里提取卵子干细胞时，这些卵子会自动生成新的卵。

A long-held theory is that women are born with all the eggs they will ever have. Researchers say they have shattered that idea by finding the stem cells which produce new eggs. Doctors at Massachusetts General Hospital used unique proteins on the surface of stem cells to fish them out of ovarian tissue.

The study, in Nature Medicine, showed that growing these cells in the laboratory resulted in new eggs being produced spontaneously. Legal and ethical rules limit research on human eggs, but the same techniques repeated on mice showed the eggs could be fertilised and produce embryos.

The findings are a long way from being used in fertility clinics but the researchers said the cells had unprecedented potential to overcome infertility. British experts said the study rewrote the rule book and opened up exciting new possibilities for women.

Quiz 听力测试

What's a long-held view about women's eggs?

Women are born with all the eggs they will ever have.

The above theory is being challenged by doctors of which country?

America.

True or false: There are some restrictions on research using human eggs.

True. Legal and ethical rules limit research using human eggs.

Has this new theory been received positively by British experts?

Yes it has. They said that it opened up exciting new possibilities for women.

Glossary 词汇表

a long-held theory 长期公认的理论

to shatter something 粉碎/驳斥

a stem cell 干细胞

to fish something out 找出原因

spontaneously 自然地/即兴地

ethical 道德的

to be fertilised (使)受孕

findings 发现

unprecedented 史无前例的

to overcome something 克服...