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What do you think is the most important invention? The TV? The printing? The telephone? Or the computer? A report show that they are not the only important invention. Here are three other important inventions.
One of the simplest inventions is the toilet(厕所). Before toilets, waste ran into rivers from people’s houses. Illness were common in big cities, and it was often difficult to find clean drinking water.
Animal food is another important invention. Before the invention, most animals were killed every autumn because there was not enough food for them in winter. After hay（干草） became a kind of common animal food, animals could live through the long winter.
The third great invention is glasses. Glasses help people read, write and do “ close work” after the age of 45. Without glasses, the world would be difficult for the people above 45.
| ____________1___________ | ||
| Some most important inventions | There other simple inventions | Before the inventions |
| The TV The 2_________ The telephoneX kB1.cOM The computer | The toilet Hay/Animal food 3____________________ | Waste ran into rivers from people’s houses. Illness were common in 4_________, and it was often difficult to find clean drinking water. Most animals were killed every autumn because there was not 5___________ for them in winter . The world would be difficult for the people above 45 . |