综合类模拟试题：词汇选项
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