小敏去一家超市买洗衣粉和肥皂，恰好赶上某种品牌的洗涤用品正在该超市搞促销活动：买一袋洗衣粉赠送一块肥皂。小敏决定购买该产品，已知洗衣粉的价格为x元/袋，肥皂的价格为y元/块，小敏一共买回3袋洗衣粉，10块肥皂，共花销（  ）

在△ABC中，角A，B，C所对的边分别为a，b，c，若向量 $\overrightarrow{m}$ =（﹣cosB，sinC）， $\overrightarrow{n}$ =（﹣cosC，﹣sinB），且 $\overrightarrow{m}\cdot \overrightarrow{n}=\frac{1}{2}$ ．

（Ⅰ）求角A的大小；

（Ⅱ）若b+c=4，△ABC的面积 $S=\sqrt{3}$ ，求a的值．

某星期六的早晨，小红同学看见弯弯的月亮挂在东边天空，此时大约为农历(    )  

下列工程技术和获得产物对应关系不正确的是（     ）

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    When I spent the summer with my grandmother, she sent me down to the 1with a list, I walked up to the counter．Behind it was an old lady named Miss Bee.
    “Excuse me，”I said. She 2“I need to get these，”I continued, 3up my list.
    “So? Go get them，”Miss Bee said.“4is here except you and me, and I'm not your servant. I suggest you get yourself a basket over there and start5.”It was not 6for a 7­ year ­old child, there were so many different kinds of things. I spent over an hour in the store.
I visited Miss Bee twice a week that summer. She 7short­changed me. Other times she overcharged. Going to the store was like going into a war. But by the end of that summer, I could finish my shopping trip8around 15 minutes. The morning I was to return home, I stopped in the store again to buy something.
    “All right，”Miss Bee said. “What did you 9this summer？”
    “That you're mean！”I replied.
    Miss Bee just laughed，“ I know 10you think of me，”she said. “Well, I don't care! My job is to teach every child I meet some life 11. When you get older you'll be glad that you met me！”Glad I met Miss Bee? Ha！How could it be?
    It sounded funny until one day my son came to me with his homework. “It's too 12 ． ”he said. “Could you finish the math problem for me？”
    “13I do it for you, how will you ever learn to do it  yourself？”I said. Suddenly, I was back in that store where I had learned to add up my bill by myself. Had I ever been overcharged since?
    Life is full of all kinds of 14. We may be 15 a hand once or twice, but luck may not find us every time. So we should work them out by ourselves.