阅读下面材料，在空白处填入适当的内容（不多于1个单词）或括号内单词的正确形式。

    Nowadays, more and more schools in China have rules making students wear school uniforms to school. A lot of Chinese students complain about____ (wear) their school uniforms every day. But do American students get ____(annoy) about their uniforms, too? American high schools usually have a dress code(衣着标准), ____ is about requirements for students' dressing. Boys at school must wear clean jackets every day. Girls are ____ (luck) than boys, for they have more flexible____ (choose) than boys. They can either dress similarly to the boys ____wear a dress. In general, it takes a student 10-15 minutes every morning ____ (dress) up for class. As students do in China, plenty of American students also have their complaints about school uniforms. What if students really dislike the dress code and want to get rid of it? Instead of getting punished, ____ (actual) there're ways to do that. At my school, "dress down" tickets ____ (sell) on school days. If students are willing to buy a ticket, they don't need to wear school uniforms the following day. I have a strong  ____ (believe) that one day Chinese students can buy these tickets, too.

根据材料内容，选择正确答案。

    Hi, boys and girls! My name is Gina. I'm an assistant at Mr. Miller's Store. Now let me say something about the store. On the first floor (层), we sell clothes for girls. The skirts in white, red, black and yellow are only $35. We have socks in all colors. They're only $8 for two pairs. How much are our sweaters? Only $25!

    If you are a boy, you can go to the second floor. Look at those baseball hats. Do you like them? They are only $6. Are you very fat? We have some big jackets for you. They are $40. We have some shorts, too. They are only $18.

    What do you need? Come to Mr. Miller's Store now!

如图，在△ABC中，∠C=90°，∠B=30°．

（1）作∠A的平分线AD，交BC于点D（用尺规作图，不写作法，但保留作图痕迹，然后用墨水笔加黑）；

（2）计算S_△DAC：S_△ABC的值．

某反应的微观示意图如下，下列说法正确的是（    ）