Read the following article and select the best answer. Article: Nuclear power's danger to health, safety, and even life itself can be described in one word; radiation . Nuclear radiation has a certain mystery about it, partly because it cannot be detected by human senses. It can't be seen or heard, or touched or tasted, even though it may be all around us. There are other things like that. For example, radio waves are all around us but we can't detect them, sense them, without a radio receiver. Similarly, we can't sense radioactivity without a radiation detector. But unlike common radio waves, nuclear radiation is not harmless to human beings and other living things. At very high levels, radiation can kill an animal or human being completely by killing masses of cells in important organs . But even the lowest levels can do serious damage. There is no level of radiation that is completely safe. If the radiation does not hit anything important, the damage may not be significant. This is the case when only a few cells are hit, and if they are killed completely. Your body will replace the dead cells with healthy ones. But if the few cells are only damaged, and if they reproduce themselves, you may be in trouble. They reproduce themselves in an unusual way. They can grow into cancer. Sometimes this does not show up for many years. This is another reason for some of the mystery about nuclear radiation. Serious damage can be done without the knowledge of the person at the time that damage has occurred. A person can be irradiated and feel fine, then die of cancer five, ten, or twenty years later as a result. Or a child can be born weak or easy to get serious illness as a result of radiation absorbed by its grandparents. Radiation can hurt us. We must know the truth. Question: According to the passage, the danger of nuclear power lies in _ . - nuclear mystery - radiation detection - radiation level - nuclear radiation
nuclear radiation

Read the following article and select the best answer. Article: Before Alaska became part of the U.S., it had been owned by Russia. Trading posts and small settlements were scattered along the coast. The rest of land was left unexplored. The Russians were mainly interested in the wealth of furs from the vast herds of seals they found there. By the mid-1800's, most of the seal herds had been wiped out, and Russia no longer wanted to keep Alaska. William Seward, Secretary of State for President Johnson, believed the United States should buy Alaska from Russia. President Johnson wasn't so sure it was a wise way to spend U.S. money, but he agreed to let Seward discuss it with the Russians. Acting quickly, Seward made a deal. On March 30, 1867, he signed an agreement for the U.S. to pay seven million dollars for the land. Many people thought it was a foolish waste of America's money. They called the deal "Seward's folly". Then gold was discovered in Alaska and public opinion changed quickly. Seward did not live to see the true value of Alaska. He died in 1872, five years after making the purchase . Each year, Alaska's natural resources have brought in many times the $7,000,000 paid for it. Natural gas, coal, oil, lumber, seafood and other minerals, besides the gold first found, have made it a valuable addition to the United States. In 1959, Alaska be-came the 49th state of the United States. Question: When Seward signed the agreement, many people thought _ . - it was a successful deal - it had its true value - he wasted U.S. money - he was clever
he wasted U.S. money

Read the following article and select the best answer. Article: A new study shows that fat people in the United States suffer direct economic and social effects because of their size. The findings are from an 8-year study of about 100,000 people. The people who were studied were between the age of 18 and 24 when the research began. The researchers who carried out the study say they consider the people fat if they are in the top of 5% of the measurement in which weight is linked to height. For example, fat women in the study were about 160 centimeters tall and weighed about 90 kilograms. Fat men in the study were about 175 centimeters tall and weighed 100 kilograms. The researchers say that more than 1,000,000 Americans are that big. The researchers found that fat young women were from wealthy families. The fat women also were 20% less likely to get married and they earned an average of about $6,700 a year less than other women. The study showed less effects on fat men. They earned an average of about $3,000 a year less than other men. Fat men also were 11% less likely to get married. Question: From this study we know fat people in America _ . - were respected - earned less - were more likely to get married - earned more
earned less