题目内容

"Re-administration" in this passage refers to giving ______.

A. the test again to people without administering beta blockers
B. the test again to both groups after beta blockers have been administered to one group
C. the test to both groups of test-takers and then giving them beta blockers
D. the beta blockers without retesting

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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

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.
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

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

A. a 14K
B. a 10K
C. an 18K
D. a platinum

Gold which is 10 Karats in proportion ______ in the U.S.

A. represents the highest grade of gold
B. cannot be sold
C. never carries a Karat quality mark
D. represents the lowest-grade gold marketable

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