题目

已知向量 与 共线，设函数。    （Ⅰ）求函数的周期及最大值；    （Ⅱ）已知锐角 △ABC 中的三个内角分别为 A、B、C，若有，边 BC＝，，求 △ABC 的面积． 答案：解（1）因为，所以 （2） ┄┄┄┄┄┄┄┄14分选择方框中所给的句子，补全对话，其中共有两选项多余。 It's Friday today．Jack （J） and Mike （M） are talking about what they are going to do this weekend． J：What can we do this weekend，Mike? I don't want to do my homework all day． M：I know，Jack．1 ______ J：No，we can't．My dad has to work at home．2 ______．Tom's going to see The Daughter of the Sea at the cinema．We can go with him． M：3______ J：Maybe we can do some shopping then．There's a new cartoon shop opening on Saturday． M：4______ J：On the corner of First Street． M：How do we get there? J：Well，shall we go by bike? My little brother is going to visit the museum，we can take him there by hike，and then we can go shopping together． M：5______ A．Shall we go to school?    B．Let’s have a party at your house?    C．How about a film?       D．No．I don’t want to see a film． E．Where is the shop?       F．I really can’t agree with you． G．That’s a great idea．