设$0\le x\le 2\mathrm{\pi }$,且$\sqrt{1-\sin 2x}=\sin x-\cos x$,则（　　　）

日常生活中，为了让同学们养成关注生活和社会的良好习惯，物理老师倡导同学们对身边一些常见的物理量进行估测的实践活动，以下是他们交流时的一些估测数据，你认为数据明显符合实际的是（）                   

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   July 4 is the birthday of the United States of America. Since 1776, people have 1 the Independence Day holiday every year.
   What do people 2on Independence Day? Many colorful and interesting things. They have fireworks shows in the evenings and sing songs. Some families organize picnics with barbecues (烧烤). Kids can3much delicious food like hotdogs.
   And these parties are a good time to dress up. Some kids make July 4 hats 4 the stars and stripes(星条) of the country's flag on them. And Independence Day is in summer. Many kids use stars and stripes fans to keep themselves 5 .
   It's a great day, but no one forgets that it's6too. US people are proud of their   7  and proud of what the founders did for it. On Independence Day everyone gets the chance to show it.