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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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反馈参考答案：
举一反三
【多选题】现代医学的新的医学目的包括
A.
预防疾病和损伤，促进和维护健康。
B.
解除由疾病引起的疼痛和不幸。
C.
照顾和治愈有病的人，照料那些不能治愈的人。
D.
避免早死，追求安详死亡。
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