The "Karat" marking on jewelry tells you what proportion of gold is mixed with other metals. If 14 parts of gold are mixed with 10 parts of base metal, the combination is called 14-Karat (14K) gold. The higher the Karat rating, the higher the proportion of gold in the object. The lowest Karat gold that can be marketed in the United States is 10-Karat gold. Jewelry does not have to be marked with its Karat quality, but most of it is. If there is a Karat quality mark, next to it must be the U.S. registered trademark of the person or company that will stand behind the mark, as required by the National Gold and Silver Stamping Act.

　　63. If a ring is stamped 24K, it has

　　A. 204 parts of gold.

　　B. 24 parts of gold.

　　C. two and four-tenths parts of gold.

　　D. 10 parts of gold.

　　64. Gold which is 10 Karats in proportion

　　A. represents the highest grade of gold in the U.S.

　　B. cannot be sold in the U.S.

　　C. never carries a Karat quality mark.

　　D. represents the lowest-grade gold marketable in the U.S.

　　65. If gold is marked with a Karat quality mark, it must also

　　A. bear a national gold and silver stamp.

　　B. bear the registered trademark of the entity standing behind the mark.

　　C. bear a "made in the USA" mark.

　　D. bear a percentage mark.

　　66. If the jewelry is marked 14 parts of gold mixed with 10 parts of base metal it will always bear

　　A. a 14K mark.

　　B. a 10K mark.

　　C. an 18K mark.

　　D. a platinum mark.

　　67. This paragraph serves the consumer as

　　A. important buying information.

　　B. a challenge to buy more gold.

　　C. a debate over gold prices.

　　D. advice about buying silver.

　　68. The Stamping Act is

　　A. a regulation for tax.

　　B. rule of law.

　　C. a law that makes such stamping mandate.

　　D. an implement.

　　Questions 69-75 are based on the following passage.

　　Mr. Faugel was convinced that student nervousness had affected their scores; to reduce the anxiety of these students who had already been tested, he gave 22 of them a beta blocker before readministration of the test. Their scores improved significantly. The other 8 students (who did not receive the beta blockers) improved only slightly. Second-time test-takers nationwide had average improvements which were similar to those in Faugel's non-beta blocker group. Beta blockers are prescription drugs which have been around for 25 years. These medications, which interfere with the effects of adrenalin, have been used for heart conditions and for minor stress such as stage fright. Now they are used for test anxiety. These drugs seem to help test-takers who have low scores because of test fright, but not those who do not know the material. Since there can be side effects from these beta blockers, physicians are not ready to prescribe them routinely for all test-takers.

　　69. Where is the only place a person can obtain beta blockers?

　　A. Supermarket

　　B. Convenience store

　　C. Stationary store

　　D. Doctor's office

　　70. Why are beta blockers not prescribed regularly?

　　A. Students are expected to do poorly.

　　B. There are side effects.

　　C. The drugs are only 25 years old.

　　D. They cause test anxiety.

　　71. According to the passage

　　A. all people can take beta blockers.

　　B. beta blockers are widely prescribed.

　　C. beta blockers work only on test anxiety.

　　D. beta blockers work only to improve test scores if the test-taker truly knows the material.

　　72. "Re-administration" in this passage refers to

　　A. giving the test again to people without administering beta blockers.

　　B. giving the test again to both groups after beta blockers have been administered to one group.

　　C. giving the test to both groups of test-takers and then giving them beta blockers.

　　D. giving the beta blockers without retesting.

　　73. What possible use for beta blockers was NOT discussed in this passage?

　　A. Test anxiety

　　B. Pain relief

　　C. Minor stress

　　D. Heart conditions

　　74. Beta blockers work on some physical and emotional symptoms because they

　　A. fool a person into a healthier stance.

　　B. interfere with the effects of adrenalin.

　　C. produce side effects worse than the symptoms.

　　D. primarily change human thought processes.

　　75. Faugel's research showed that beta blockers given to his sample

　　A. increased scores less than the national average.

　　B. increased scores the same as the national average.

　　C. decreased scores.

　　D. increased scores much more than the national average.转