* Read the passage and then do the tasks that follow.
In humankind’s millions of years on earth, many types of energy resources have been used. However, in the last ninety years, petroleum has become by far the most important. Accounting for over 50 percent of all energy consumed, it is so essential that, without petroleum, we could be faced with economic disaster.
Of course, the earth’s supply of petroleum will not last forever, and in fact, it will disappear sooner than most people believe. At the current rate of consumption, the world’s proven oil reserves may be exhausted within forty or fifty years.
1. How long have many types of energy resources been used?
They have been …………………………………………………………………………………………………………
2. How long has petroleum become the most important?
It has ………………………………………………………………………………………………………………………
3. What could we be faced if there were no petroleum?
We could …………………………………………………………………………………………………………………
4. According to the passage, how long may oil reserves be exhausted?
They may …………………………………………………………………………………………………………………
