I have been very lucky to have won the Nobel Prize twice. It is, of course, very exciting to have such an important【C1】______of

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问题     I have been very lucky to have won the Nobel Prize twice. It is, of course, very exciting to have such an important【C1】______of my work, but the real pleasure was in the work itself.
    Scientific research is like an exploration of a voyage of discovery. You are【C2】______trying out new things that have not been done before. Many of them will lead【C3】______and you have to try something different, but sometimes the experiment does【C4】______and tells you something new and that it really exciting.【C5】______small the new finding may be, it is great to think "I am the only person who knows this" and then you will have the fun of thinking what this finding will【C6】______and of deciding what will be the【C7】______experiment.
    One of the best things about scientific research is that you are always doing something different and it is never【C8】______. These are good time when things go well and the bad times when they【C9】______Some people get discouraged at the difficult times, but when I have a failure my policy has always been not to worry but to start planning the next experiment, 【C10】______is always fun.
【C2】

选项 A、presently
B、repeatedly
C、periodically
D、continually

答案D

解析
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