SOURCES OF ENERGY
When man first appeared on earth, his greatest source of power was his own physical strength. As he grew wiser, he learned to make animals supply power for him. Then, many centuries later, he discovered that wind and water were even better power sources than animals. Still later he found that power from steam, coal, and oil was often even better than these.
In the latest search for improved living, physicists - scientists who study energy and matter - have been led to the study of the atom. The physicists have found that atomic energy can do such things as supplying electricity to cities, blasting out harbours, running ships and submarines, and may soon provide energy for space flights.
Finding ways to make the atom work for us is a new science. It just started in the twentieth century. However, by working with atoms, scientists have found that these tiny storehouses of energy can both help and, unfortunately, harm mankind.
Questions
1. What was man’s first source of energy?
…………………………………………
2. What sources were found better than animals, wind and water?
…………………………………………..
3. What are the uses of atomic energy?
…………………………………………...
4. When was atomic energy first used?
…………………………………………….
II. Complete each gap with ONE suitable word from the list. (1.5 ms.)
take - electricity – make - being - has – wastes – another - such
The search for alternative sources of energy (1).... led in various directions. Many communities are burning garbage and other biological waste products to produce (2) ....... Converting waste products to gases or oil is also an efficient way to dispose of (3) ……. . Experiment work is being done to derive synthetic fuels from coal, oil shale, and coal tars. But to date, that process has proven expensive. Other experimental are underway to harness power with giant windmills. Geothermal power,
đang được dịch, vui lòng đợi..