填空题

Tens and thousands of years passed before wheels were used to make a vehicle.

【参考答案】

Y
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自信在学习、工作中的重要作用不言自明;2.自信完全不同于自负,它是建筑在个人的学识、判断和才智基础之上的。3.许多学者和职业人士,都强调自信在人生道路中的关键作用,这对于我们都有一定的启示作用。Self-confidence:An Important Factor for Success
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Manufacturers found out that color affects sales ______.
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