Swapping postcards has become an interesting hobby for people who are curious about the big world in which they live .Swapping postcards can keep pen friends in touch .A postcard is a simple and beautiful way for someone to share his thoughts and memories .

There are some great websites that can help one develop his interest in postcard swapping .For example,postcrossing.com,started in 2005 by a Portuguese citizen,is a free website that connects people who share a passion for swapping postcards.If you want to receive postcards from other members ,you should e-mail a postcard to the address sent by the website after registration(注册) .After the individual confirms that he has received the card, your name will be added to the list of people to receive postcards .

Swapping postcards with people in other countries is also a great way to learn about the world;each postcard can be a window to another culture. It is like bringing the world to your mailbox.

Fiona, a member of postcrossing.com,says,''I love swapping postcards!Although it seems quite time-consuming to pick one ,write it and post it ,it is the amusement of receiving a flash of sunshine or humor that makes it worthwhile.''

51.The underlined word ''Swapping''in Paragraph 1 means ____ .

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You are required to write A Welcoming Speech according to the given information in  at least 100 words. Remember to write it in the corresponding space on the Answer Sheet. 

背景：林翔是某本科高校的学生会主席，在欢迎“专升本”新同学的活动中致欢迎辞。 

要求：请为林翔写一篇英语欢迎辞，要求内容包括： 

1）表示欢迎与祝贺； 

2）提出一些学习、生活等方面的建议； 

3）表达良好的祝愿。   

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71  (Can love really last a lifetime?) Absolutely. 72  (But only if you believe the fairy tale of living happily for ever.) A team of scientists recently found that 73  (romantic love involves chemical changes in the brain that last 12 to 18 months. )After that, you and your partner are on your own. Relationships require maintenance. 74  (Pay a visit to nursing home if you want to see proof of lifelong love.) Recently I spoke to an old man whose wife of 80 years was suffering from advanced Alzheimer’s disease. 75  (He came to sit with her every day and hold her hand.) “she’s been my best friend since high school,”76   (he told me," We made a promise to stick together." )Now that is a love story.

注释：nursing home 养老院；Alzheimer’s disease 老年痴呆症 

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Talking to many people is necessary for one to understand a whole ______.

To protect your identity online, you’d better not use your ______.

Giving ______ information to anyone online could be dangerous.