III.克漏字:30%
         (a)Between 1997 and 2005, the number of annual motorcyclist fatalities doubled.
Motorcyclist fatalities  now  21  over 10 percent of all traftic-related fatalities. It seemed thateach motorcyclist was required thathe   22   safety helmets. However, over the last threedecades, states   23   laws that require helmet use among all motorcyclists. But according to astudy on within-vchicle comparisons among two-rider motorcycles, helmet use reduces fatalityrisk  24  34 percent. Fatality reductions of this  25  show that the health benefits ofhelmet-use laws are not meaningfully compromised by compensating increases in risk-taking bymotorcyclists.
【題組】21.
(A)account for
(B) amount to
(C) deduce from
(D) gross up)