题目

Last night’s meteor(流星)shower left many people in the community dissatisfied and demanding answers. According to Gabe Rothschild, Emerald Valley’s mayor, people gathered in the suburbs of the city, carrying heavy telescopes, expecting to watch the brightly burning meteors passing through the sky. What they found instead was a sky so brightened by the city’s lights that it darkened the light of the meteors passing overhead. “My family was so frustrated, ”admitted town resident Duane Cosby. “We wanted to make this an unforgettable family outing, but it turned out to be a 下列各组粒子中只具有还原性的是（ ）A．F－、SO2、KB．Na、Zn、I－C．Fe3+、NO3－、SO42－D．Fe2+、O2、H2O2