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题库 / Prep2007E2-SC-144
Meteor showers and individual streaks of light that flash across the sky every night are generated when tiny flecks of celestial detritus, often no larger than grains of sand or of pebbles, burn up speeding through the atmosphere.
grains of sand or of pebbles, burn up speeding
grains of sand or pebbles, burn up while speeding
grains of sand or pebbles, which burn up while speeding
a grain of sand or pebble, which burns up as it speeds
a grain of sand or a pebble, burns up when it speeds
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根据前面 not larger than 可以选出平行结构-ABC；A明显不对，排除；
剩下BC，C的which指代前面的pebbles，这个小圆石无法burn up·····排除，或者直接看前面句子成分 when tiny flecks of celestial detritus 没有谓语，后面肯定是直接接一个谓语，可选B。
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