71.  The backbone provider are the Internet players that typically own by connect to each other to exchange data of their customers and National Science Foundation, for example, PSIX.

72.  Because comprehending by analogy is a good way to study for everyone.

73.  We could easily to contact our family or friends through email or IM software like MSN; we also could find every information we want by the search engine like Google.

74.  However, others believe it dangerous that we make as much as friends before we judge them by further acquaintance and know if they are good for us.

75.  Environment determines people's way of living which can be seen by comparing northen China with southern China.

76.  Different study fields may improve their skills by imitate from the others.

77.  If you only study in that field, you can only get to know what that has been studied by someone else never will you work with something new, you are always spending your time doing what has been done.

78.  Admittedly, science can reassure people by explain the mysterious phenomenon, and arts can upset people by let us see things we can't discover with our own eyes.

79.  Admittedly, science can reassure people by explain the mysterious phenomenon, and arts can upset people by let us see things we can't discover with our own eyes.

80.  Peoples' view on the Internet vary from person to person, some hold that the Internet has changed our lifestyle greatly by enabling our social life much more fruitful and convenient.