Direction: In the following questions, read the passage carefully and choose the best answer to each question out of the four alternatives.
PASSAGE
Radium is a while powder that looks like table salt. A pound of it is worth a thousand pounds of gold. Radium is very costly because it is so scarce. A mere pinch of it is worth a small fortune. There are only a few spoonfuls in all the world. But radium is so powerful that too much of it would be dangerous. If a pound or two could be gathered at one spot it would kill people who came near. Through radium, scientists hope to learn how to change one element into another. It would be interesting and profitable to change other metals into gold. But it would be worth more to man to learn how to get all the power from the atoms to do man’s work.