在△ABC中，“∠A＝30°是“sin A＝”的(　　)．

阅读理解，根据材料内容选择最佳答案。
    The Macintosh family is in England. Mr. Macintosh is a farmer(农场主). He has three people help him on the farm. They help him look after the animals(照顾动物). Mrs. Macintosh is a teacher. She teaches math. She can play the piano and the guitar. Mr. and Mrs. Macintosh have one son and one daughter. Their son's name is Tom and their daughter's name is Fiona. Tom and Fiona like music very much. Tom can play the guitar and his sister, Fiona, can play the piano. Tom and Fiona go to the school music club every Wednesday. Next month they will play for all the teachers and students in their school. Mrs. Macintosh is very happy for them. Mr. Macintosh can't play the guitar or the piano but he can sing. Sometimes, the family plays and sings together(在一起) after dinner in the evening. That's Mr. Macintosh's favorite family activity(活动).

如图在△ABC中，M是BC的中点，S_△ABC=16，则S_△ABM是（   ）

  100多年前的辛亥革命是20世纪中国第一次历史性巨变。阅读下列有关材料并回答问题。

材料一 孙中山是中国近代政治文明——共和制的重要催生人。他的学说是“内审中国之情势，外察世界之潮流，兼收众长，益以创新”。

——《中华文明史》第4卷

材料二 同盟会提出决断性民族主义的口号：“驱除鞑虏，恢复中华” ……显然，最初同盟会已把满族排除在帝国之外，同时也把关外的满洲土地排除在帝国之外。不仅如此，其实孙中山同盟会已把蒙古，西藏，新疆等排除在中国之外了。孙中山很快就认识到这是个问题，并且发生一定程度的转变。1906年，孙中山说“民族革命是要尽灭满洲民族，这话大错。……我们并不是恨满洲人，是恨害汉人的满洲人。”

――《帝国的分裂与保存》

材料三 当今史学界对中国近代史和现代史的历史分期有两种观点：一种主张把1911年的辛亥革命作为两者的分界线，另一种主张把1949年的新中国成立作为两者的分界线。（注：历史分期旨在揭示不同历史时期或阶段之间的质的差别，从中发现其发展特点及规律。）

——《换个角度看辛亥革命》

   I am Bill Jones. I am a teacher of English. My wife is Linda Jones. She is a nurse. We have a daughter and a son. We have many friends.
Look! These are my friends. This is Mr. Black. He is a worker. He works in a shoe factory He makes shoes there. That’s Mrs. Black. She is a worker on a farm near here. The girl is their daughter. She is a student. She is thirteen. The boy is their son. He is a young soldier（战士）. His name is Carl Black.