大家多做练习哦！
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
