简述二尖瓣关闭不全的治疗

My mother, Marisol Torres, came with her family to Australia in the early 1960s. Then my parents’ marriage ended and Mum began the study of precious stones. Her interest in opals (猫眼石) took her to the New South Wales remote town of Lightning Ridge. There were no luxuries (奢华的享受), but she was closer to nature and had a chance to find black opals and make some money.

My mother was beautiful with dark hair and brown eyes, but she was also quiet and shy. Early in the Ridge years, she kept to herself, but later, she started going to the neighbourhood centre to make friends.

It was her dream to mine, but her get-rich-quick thinking was unrealistic. She was cheated and she was never very successful. But she kept a sense of humour and a charming smile.

Then, just as friendships began to blossom, she was diagnosed with cancer and had to return south for treatment. She had the intention of cooking Spanish food as special treat for her Ridge friends, but died too soon. In her honour, my aunt, Marisa, and I fulfilled her desire when we visited the Ridge in March last year.

People who mine the Ridge come from a cross section of society, from lawyers to travels. Looks don’t mean much: it can be hard to tell who is millionaire and who is poor. Opals attracted Sebastian and Hanna Deisenberger to Lightning Ridge. They planned a two-year stay, but became permanent residents.

Then there’s Neil Schellnegger, 45, who moved to the area with his parents when he was a child. He lives with his son, Luke. Luke is a shy 19-year-old boy who enjoys helping his dad. They haven’t had much luck over the past couple of years, but their passion for opals conquers disappointment. They love the peaceful lifestyle.

Danny Hatcher, 38, is a second-generation miner and president of the Lightning Ridge Miners’ Association. He is an optimistic man, driven by the desire to find the perfect opal. “It’s magic,” he explains. “Once you start opal mining you don’t want to do anything else… There is always the potential for finding a million dollars. Nothing beats it.”

It’s a place where dreams --- spiritual or material --- can be fulfilled; a place, for one last bet in life.

小题1:What made the author’s mother go to Lightning Ridge?

A．The luxurious life there.

B．Her new marriage there.

C．Her interest in opals.

D．Her passion for nature. .小题2:After the author’s mother died, she fulfilled her desire by __________.

A．treating her mother’s Ridge friends with Spanish food

B．writing a biography about her whole life

C．decorating her house in Lightning Ridge

D．finding a lot of black opals in Lightning Ridge小题3:We know from the passage that _________.

A．the rich and the poor can be distinguished by their looks

B．Luke is a successful miner, just like his father

C．Sebastian is planning to leave Lightning Ridge

D．Danny Hatcher’s parents were miners in Lightning Ridge小题4:Lightning Ridge is a place where dreams can be fulfilled because __________.

A．there are precious stones and life is peaceful

B．there are people from all walks of life

C．there are rich people who can help poor people

D．there is a lot of gold hidden in the ground小题5:What is the author’s purpose of giving Neil Schellnegger and Danny Hatcher as examples?

A．To show the magic power of opal mining.

B．To tell people it isn’t always hard to mine opals.

C．To warn people not to take up this kind of job.

D．To persuade people to look for more resources for the country.

为什么乙没有去实现自己的梦想

A．因为病情加重而无法完成心愿

B．因为他认为自己还有很多时间

C．因为他早已忘记了自己的梦想

D．因为他想治好病再去完成梦想

手工电弧焊常用坡口的基本形式有（）、（）、（）、（）、（）等。

商业经营型房屋建筑，应根据经营资料计算净收益。净收益为商品销售收入扣除商品销售成本、______等。

A．经营费用

B．商品销售税金及附加

C．管理费用

D．财务费用

E．商业利润