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设乙、丙以甲免除戊的债务未经其同意为由主张无效，甲的免除行为效力如何？依据何在？

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报考英语专业的考生必做，非英语专业的考生不必做。
For this part you are allowed 30 minutes to write a composition on the topic: Make Our Cities Greener. You should write no less than 150 words and base your composition on the outline (given in Chinese) below.
1. 城市绿化的现状。
2. 绿化的好处(如：清闲空气，美化城市，改善气候……)。
3. 怎样才能实现绿化。

听力原文：M: Good afternoon everyone and welcome. Thanks for coming. My name is Keith Gloster. Today I will talk about ten high-impact viral marketing strategies. The term "viral marketing" has been tossed around the Internet for the past three years now. If you've been marketing online for a while, chances are that you've heard legendary marketers like Mark Joyner, Marion Sanders and Yanik Silver refer to this term countless times. But do you REALLY understand what this marketing term means and how it can greatly impact the success of your online business？ If not, here's a brief definition: Viral marketing involves allowing people to give away and use your free product or service in order to multiply your marketing quickly over the Internet. The ides behind viral marketing is that you include your ad with the' freebie people give away or use. Below are ten high impact viral marketing strategies:
1. Allow people to reprint your articles on their web site, in their e-zone, newsletter, magazine or e-books. Include your resource box and the option for article reprints at the bottom of each article.
2. Allow people to use any of your freebies as free bonuses for products or services they sell. Include your ad inside all of your freebies.
3. Allow people to use your online discussion board for their own web site. Some people don't have one. Just include your banner ad at the top of the board.
4. Allow people to sign up for a free web site on your server. Since you are giving away the space, require them to include your banner ad at the top of the site.
5. Allow people to add their link to your free web site directory. Just require that they return a link back to your web site, advertising your directory.
6. Allow people to provide your free online eservice to their web site, visitors, or e-zine subscribers. They could be free e-mail, e-mail consulting, search engine submissions, etc.
7. Allow people to give away your free software. Just include your business advertisement inside the software program.
8. Allow people to give away your free web{ design graphics, fonts, templates, etc. Just include your ad on them or require people to link directly to your web site.
9. Allow people to place an advertisement in your free e-book if, in exchange, they give away the e-book to their web visitors or e-zine subscribers.
10. Allow people to give away your free e-book to their visitors. Then, their visitors will also give it away. This will just continue to spread your ad all over the Internet. Now that you have a better understanding of viral marketing and the above 10 strategies, what's next？ Start experimenting with what you've discovered. Use one or more of these proven strategies. Brand yourself and grow your list and income exponentially.
？You will hear a business presentation about High-Impact Viral Marketing Strategies.
？As you listen, for questions 1—12, complete the notes, using up to three words or a number.
？You will hear the recording twice.
HIGH-IMPACT VIRAL MARKETING STRATEGIES
NOTES
Business Presentation
1. The term "viral marketing" has been discussed on the Internet for the past
Definition
2. Viral marketing includes allowing people to give away and use your free product or service in order to
3. The idea behind viral marketing is that you include your ad with the
High impact viral marketing strategies:
Allow people
4. to reprint your articles on
5. to use any of your freebies as
6. to use your online discussion board for their own web site, at the top of which, include
7. to sign up for a free web site

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请制定一套合理的水环境质量现状调查监测方案。