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请从以下两小题中任选一个作答,若多选,则按所选的第一题计分:

A.边长2cm的正六边形的边心距是____ cm;

B.小明同学在距某电视塔塔底水平距离500米处,看塔顶的仰角为20°,(不考虑身高因素),则此塔高约为____米.(用科学计算器计算,结果保留整数)

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    Confidence is a skill that many folks want to master, but have a hard time acquiring. Have you ever wondered why? Possibly you were born confident. You were talked to negatively as a child or maybe you were rejected many times. Whatever the case is____ But how to boost your confidence?

    Begin to act as if you are confident. Act as the person you would want to be like____ Surround yourself with people who you think are confident and have high value. You will learn so much from observing other confident folks.

    ____One of the most areas that you need to pay attention to is your self-talk. Your thoughts about your capabilities and self-worth need to be positive and encouraging. Whenever you notice you think negatively, pause and take a moment, and shift your focus to something that can help you feel better about yourself.

    Go after your goals. If you are really serious about building self-confidence, you need to identify your goals and go after them. The more you add to your accomplishments, the more confident you will feel about your abilities and skills____

    By using these steps to boost your confidence____

A. Always stay positive.

B. Improve your self-talk.

C. Begin to think and behave like them.

D. This requires you to know what a confident person looks like.

E. you will be on the path to improving your self-esteem (自尊) and self-worth.

F. You'll begin to trust your inner self more and appreciate yourself more.

G. you should know you can improve your self-esteem and build confidence.