1.The old concerns lose importance and some of them vanish altogether. A. develop B. disappear C . linger D. renew来源：考试大 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来源：www.examda.com 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来源：考试大 15. The other women seemed contented and they even exhibited their bellies with pride. A. demonstrated B. uncovered C . spread D. showed 来源：www.examda.com Key: BACCD CCBAB CDABDExamda.com