One of the most important discoveries of the nineteenth century was a method of using natural gas for cooking and heating. Large amounts of natural gas are found in the United States, usually several feet below the surface of the earth. Natural gas is most often found in places where petroleum, the oil from which gasoline is made, is found. Often the natural gas must be removed before the oil itself can be reached.

For many years after natural gas was first discovered, it was thought to have no value. Finally, however, people began to understand its use and to find ways of storing it and moving it from place to place. Today natural gas is stored in large tanks and used for lighting, cooking and heating. It has also been used for electric generators and hybrid cars recently. In many ways natural gas is one of our finest fuels. It can be used for cooking without making the room hot. It is cheap and can be moved easily from one place to another through long pipelines, some of which are hundreds of miles in length.

81. It can be inferred from the passage that ________.

    A. natural gas is useless                                                                            B. people once wasted natural gas

    C. natural gas is moved in trucks                                                              D. natural gas is found where there is no petroleum

82. This passage as a whole is about ________.

    A. discovering natural gas                                                                  B. finding petroleum

    C. using natural gas and petroleum                                                     D. natural gas and its use

83. Which of the following is NOT true about natural gas?

    A. It is not used for heating.            B. It moves through pipes.                       C. It is cheap.                      D. It can be stored.

84. According to the passage, the easiest way to move natural gas from one place to another is ________.

    A. to liquidize it and move it through pipelines.                                       B. to liquidize it and move it by trucks.

    C. through pipelines.                                                                                  D. to store it in large tanks to move.

85. How many uses of natural gas are mentioned?

   A. two                                               B. three                                                    C. four                                 D. five