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For most 1, non-stop Internet connectivity is the fuel of college life. 2just toys, this instruments are powerful tools for the storage and management of virtually every kind of information. And as more people around the world _3_ this instruments, they are becoming indispensable. So students should use the 4 of the Internet to do homework , review lecture outlines, take part in class discussions and network online with their friends. But in doing so, students must remember to regulate and _5their time.Too much time online can6 too little time in real-life studying or exercising or visiting with friends. Students should not let the Internet world on their computer screens take them away from 7__outside.

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Other colleges are 1 to stand out from their peers. The race to attract students with the most modern networks and the hottest systems has 2. Some business 3 are receiving free portable computers. In an always-connected mode, they can get information anytime and anywhere they need. One university is even giving its freshman new smartphones to 4 the student experience and prepare them for success in a rapidly changing world.

Another hero from the 1 in Tuscon was Dory Stoddard. Dory gave his life for his wife, Mavy. Dory and his wife had been friends since childhood and when Dory heard shots 2 he immediately fell on top of his wife to shield her from the 3 . At the 4, the priest said:" Dory didn't die a hero; he lived a hero." Long known for his 5 spirit and love of humanity, Dory Stoddard died as he had always lived, assisting others.

The 1 stories of heroes help remind us that 2 people can do 3 things, whether it is in the 4 or as part of everyday life. We honor the firemen, the policemen and the average citizen by recognizing their 5. Perhaps, even more 6, we honor them by working to change the circumstances that led to their death. By honoring them, we can be 7 by them. Will we be heroes when circumstancescall on us to act heroically?_8___, we will.

天然蛋白质一般均含_____、_、_、_____等二级结构。