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【单选题】
你认为下面哪句话，应该出现在摘要的第一句A.
Innovation, defined as creativity with a purpose, is widely considered to be the engine of scientific progress.
B.
However, the recent introduction of cleaner technologies in the UK has led to reductions in the emissions of nitrogen oxides, with concomitant decreases in N deposition.
C.
We find that ozone production occurs at lower NOx and much larger VOC concentrations than does its summertime urban counterpart, leading to carbonyl (oxygenated VOCs with a C = O moiety) photolysis as a dominant oxidant source.
D.
It is our hope that this information will aid and encourage researchers to implement gene-targeting techniques into their research program.
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【简答题】任意买一张电影票，座位号是奇数，这是______事件．（填“确定”，“不确定”）
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