题干

已知函数 y=sinπ
a
2
x(a>0)
在区间(0,1)内至少取得两次最小值,且至多取得三次最大值,则a的取值范围是____
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    Now, if you want to be charming, then you'll need to build self-confidence, but becoming more outgoing is actually pretty easy. To get to a point at which you feel comfortable talking to complete stranger, follow these steps.

    Encourage your curiosity about people____I wonder what his parents look like. I wonder what her favorite color is. Is he from around here? Is she the girl I saw at the movie theater last week? It will take some conscious effort, but you can't be outgoing if you don't care about people.

    Smile at others. Make it a goal to smile at one person a day. It can be anybody, and it can be the most subtle(微妙的) of smile. A quick glance paired with a smile---then run away if you want!____Eventually, you will want to get to a point where you smile instinctively whenever you make first eye contact with someone.

    Ask people questions. The standard ”how are you?” doesn't really count, because people use it as a greeting rather than a real question____This is where the curiosity and interest in others come into play.

    ____This is key to being a good conversationalist. If you don't make enough eye contact, the other person will feel invisible and the sense that you're elsewhere mentally. If you make too much, they'll feel uncomfortable. Is that specific enough for you?

    Note your body language____To show that you're outgoing and welcome conversations, keep your body open, you head up, and a smile on your face. Resist playing with your phone or otherwise occupying yourself.

A. Master eye contact.

B. Never hesitate to smile at others.

C. Most of communication isn't verbal.

D. The more you do it, though, the less scary it will be.

E. Make eye contact when you're asking questions about people.

F. Wherever you go, try to observe people, and ask questions about them.

G. If you've already exchanged eye contact and smiles with someone, start off with a question,