A、A group of men searching for gold in California. B、A immigration peak in the American history. C、Women from other countries in

W：I’m Faith Smith. This week on our program, we will look at international marriage brokers who help American men marry women from other countries. (22)Mr. White is our interview spot. He has done lots of research on marriage.
M: Thanks a lot. It’s good to be here.
W: Some people will celebrate this Valentine’s Day with someone they met on the Internet through a dating site. Actually dating sites are popular in some countries these days. But we have to say dating sites are not the only online places where people look for relationships.
M: Yes. In America, the business of men sending for women from other countries began in the Old West in the 1800s. There were many men living on the frontier. (23)These included the "forty-niners"—men who moved to California in 1849 to search for gold. But there were very few women willing to join them.
W: How to solve this problem?
M: As a result, demand grew for women from other countries. They were called "picture brides"—better known today as "mail-order brides."
W: So, these days, women who advertise online for husbands are called "e-mail-order brides." (24)But some people consider all these terms insulting.
M: (24)Oh, they say these terms suggest that the women are products that can be purchased. But finding an American husband might provide an escape from a life of poverty or danger or loneliness. No one blames people for seeking a better life.
W: (25)One study of agencies that list women seeking husbands found there were around ten thousand "mailorder marriages" a year. About four thousand of these involved men are from the United States.
22. What does the man probably do according to the conversation?
23. What does the "forty-niners" mean?
24. Why don’t some people like the name of "e-mail-order brides"?
25. What can we infer from the study?