题目内容
(请给出正确答案)
[单选题]
I was _____ as to how I could help him out without hurting his pride.
A.quite useless
B.rather uncertain
C.quite unprepared
D.wonder
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B.rather uncertain
C.quite unprepared
D.wonder
A.对于污染大气,HO·主要来源于醛的光解,尤其是甲醛的光解
B.O3的光解是清洁大气中HO·的主要来源
C.HO·的光化学生成率白天高于夜间
D.HO·有很高的活性,具有强氧化作用
A.Synonymy
B.Polysemy
C.Homonymy
D.Antonymy