What enables some people to get big creative breakthroughs while

What enables some people to get big creative breakthroughs while others only get small and?non-creative breakdowns,blaming themselves and society?Are some people“gifted”?Are there?other factors?21?work—factors that we have more control over than we think? While nobody can deny the?22?that some people seem to be blessed with particular?creativity,research shows that anyone can?23?their chances of coming up with new and original?ideas?24?they would only engage themselves more in the process of?25．It′s the old Thomas?Edison thing about“discovery?26?99 percent perspiration(汗水)and 1 percent inspiration．”27,the studies prove this:great creative breakthroughs usually happen only?28?intense?periods of struggle．It is sustained effort towards a specific goal?29?eventually prepares for great?creative insights． This kind of sustained effort does not always?30?immediate results,a fact that not only?separates the innovators(革新者)from non-innovators,but?31?leads some people to conclude?that it is just not?32?for them．“Maybe I should have gone to medical school like my mother?wanted,”they wonder when the breakthrough is?33?to be found．Alas,one forgets during their?inevitable encounters?34?self-doubt,that the big surprise is never?35．Indeed,it can happen?at any time and place． 第21题的答案是（ ）
A、to
B、in
C、at
D、by
【正确答案】：C
【题目解析】：答案解析：此题考察的是介词的使用。根据上下文，“factors that we have more control over than we think”指的是我们比自己认为的更能够控制的因素，这里的“控制”是指在某个特定点或方面的控制，因此用介词“at”表示在某个点或方面的控制是最合适的。所以选项C“at”是正确的。