A、By accumulating experience in learning. B、By knowing the linguistic theories of foreign languages. C、By spending more hours on

W: Have you ever noticed advertisements recently?
M: Not yet. Is anything new?
W: Yeah.(9)Some advertisements say " Learn a foreign language in six weeks, or get your money back!" "From the first day your pronunciation will be excellent. Just send. . . " and so on.
M: A few people try to learn a language fast by studying for six or more hours a day. Do you think it is a very effective way to learn a foreign language?
W: No.(10)It is most effective to learn the language in the country where it is spoken. There you come into contact with it all the time.
M: I can’t agree with you more. But most people can’t afford this, and for many of them, it is not necessary.
W: However, foreign language, especially English, is an indispensable part of our life. People need the language to do their work better.(11)For example, scientists and doctors need to be able to read books and reports in foreign languages. So they should spare a lot of time to learn the language.
M: Yes. They have to. If people can’t learn the language in its native land, it is a little more difficult for them to learn. Of course, it’s impossible for everyone to go abroad.(12)And we can achieve great success as long as excellent ways of language learning are adopted.
W: Besides, perseverance is very important. We should accumulate what we learn gradually and put them into practice.
9. What can we learn from the advertisements?
10. What is the most effective way to learn a foreign language according to the woman?
11. Why do scientists and doctors have to learn foreign languages?
12. How can most people learn a foreign language successfully according to the man?