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 1990.
A.in
B.around
C.from
D.before
答案:BACCD
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