1.The old concerns lose importance and some of them vanish altogether.

　　A. develop B. disappear

　　C . linger D. renew

　　2. In the United States educational system, intermediate school is the transitional phase between the primary grades and high school.

　　A. stage B. notion

　　C . pattern D. alternative

　　3.Fluoride deters tooth decay by reducing the growth of bacteria that destroy tooth enamel.

　　A. facilitates B. overwhelms

　　C . inhibits D. loosens

　　4. The firm of Bonnin and Morris in Philadelphia was probably the first American company to manufacture porcelain.

　　A. silverware B. crystal

　　C .china D. linen

　　5.Gunpowder was used extensively in firearms prior to 1890.

　　A. in B. around

　　C . from D. before

　　6.We packed up the things I had accumulated over the last years and left for good.

　　A. close B. near

　　C . past D. final

　　7.The chemical is lethal to rats but safe to cattle.

　　A. toxic B. harmful

　　C . deadly D. contagious

　　8.She is very conscientious about her work.

　　A. worried B. careful

　　C . anxious D. nervous

　　9. She has consolidated her power.

　　A. strengthened B. won

　　C . hardened D. united

　　10.The drinking water is contaminated with impurities.

　　A. blackened B. polluted

　　C . darkened D. mixed

　　11.Her novel depicts a futuristic America.

　　A. writes B. sketches

　　C . describes D. indicates

　　12. He expressed concern that the ship might be in distress.

　　A. despair B. difficulties

　　C. need D. danger

　　13.They are endeavoring to change society as a whole.

　　A. trying B. working

　　C . doing D. making

　　14.Your eternal boasting annoys everyone.

　　A. unchangeable B. everlasting

　　C . boring D. monotonous

　　15. The other women seemed contented and they even exhibited their bellies with pride.

　　A. demonstrated B. uncovered

　　C . spread D. showed

　　Key: BACCD CCBAB CDABD

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（实习编辑：高奕飞）