61. Divers today try to bring to the surface _______.

　　A. gold and jewels B. parts of ships

　　C. whole ships D. all of the above

　　62. Diver try to bring up metals because ________.

　　they have been in the sea for a long time

　　gold and jewels are not valuable things

　　some kinds of metals are worth a lot of money

　　it is easy to bring up metals

　　63. The word “surface” in the passage means the ______.

　　A. market B. air C. top of a liquid D. sea

　　64. John Light hopes that he may be able to sell all the parts of the “Lusitania” for about _____.

　　A. $12，000 B. $300，000 C. $1，200，000 D. $1，800，000

　　65. John Light bought the “Lusitania” _______.

　　A. before 1915 B. before it sank

　　C. after it sank D. after they had brought up the propellers

　　Passage Two

　　Man‘s first real invention， and one of the most important inventions in history， was the wheel. All transportation and every machine in the world depend on it. The wheel is the simplest yet perhaps the most remarkable of all inventions， because there are no wheels in nature—no living thing was ever created with wheels. How， then， did man come to invent the wheel? Perhaps some early hunters found that they could roll the carcass of a heavy animal through the forest on logs more easily than they could carry it. However， the logs themselves weighed a lot.