51. What does the passage mainly discuss regarding scientific research?

　　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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　　47 How are almost half of our daily actions performed according to the passage?　　A) Out of habit 　　B) Wi

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　　46 What does the author say we need to do to strengthen our willpower?　　A) Keep it under control 　　B) A

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