1.        In 1973, President Nixon adopted the 55-mph national speed __21__ as a measure to savefuel. The measure succeeded in reducing speeds on the nation’s highways, breaking an unbroken trendof increasing speed that began __22__ the early 1940s. The adoption of such policy had a significantimpact __23__ the nation. With the reduction in speeds on U. S. highways came a significant drop inaccident and fatality __24__ , as well as a reduction in the total number of highway deaths nationwide__25__ year.
【題組】21.
(A)limit
(B)restrict
(C)reduce
(D)deterioration
(E)lessen