53. What would scientific studies look like in a perfect world according to the

　　52 What do we learn from the passage about researchers like birdwatchers and rock collectors?　　A) They have

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　　51 What does the passage mainly discuss regarding scientific research?　　A) Its foundation 　　B) Its rewards

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　　50 Why can it be difficult for us to maintain self-control?　　A) Most of us are not in the habit of exer

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　　49 How does the art of self-control help us succeed?　　A) By allowing us to remain clear-headed permanently

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　　48 What will help people stick to doing something constructive automatically?　　A) Practising it on a day-to-

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