题目

已知函数的最小正周期为，则的最大值为________． 答案：【答案】4【解析】首先根据三角函数的周期得到，再求函数的最大值即可.因为，所以，所以的最大值为4．故答案为：  [2015山东实验中学三模] Alyssa Carson is 13 years old. And she 回^^回made the headlines in 2014 by announcing SJ^KhJtSj her determination to be the first person to.^Sfiff land on Mars. Wishful thinking? Well, NASA thinks she stands a chance.  And she is already in training,becoming the first person to attend three of NASA's world space camps.  13-year-old Alyssa Carson is using a video simulation to land a robotic explorer on Mars. At the moment,it's the closest she or anybody else can get to the Red Planet. J But for as long as she can remember, Alyssa has dreamed of being the first person to actually land on Mars. "It was calling me. I could just sense that I needed to go there. Something told me it was my future destination," says the little girl.  Although a mission to Mars might be decades away,Alyssa is already in training. She's completed several NASA space camps including one in Turkey. " At the space camp,you train,eat and sleep. You live the life of an astronaut. Also,we do the MMU,which is the man?ned maneuvering unit. It's kind of like a big jet pack. And also,you get to do a mission," she told the reporter.  At the Baton Rouge International School,Alyssa is learning French and several other languages including Chi?nese. And of course,she is studying science and maths essential for her planned degrees in astrophysics and astrobiology.  "I have never seen anyone as dedicated and passionate about their dream as this kid is about getting to Mars." says Alyssa's father,a single parent who has dedicated his life to fulfilling his daughter's ambition. "I've lived my life. I've,you know,had my fun all around the world. So now it's her time. And it's my job as her dad to support that and to be by her side and do whatever it is that she needs to support this dream."11. Alyssa Carson became famous because         .   A. she's been given the chance to land on Mars   B. she's the first person to attend a space camp   C. she's designed a robotic explorer to land on Mars   D. she's determined to be the first person to Mars 12.Which of the following words can best describe Alyssa Carson?   A. Stubborn. B. Ambitious.    C.Imaginative. D. Wishful.13. What can we infer from the text?   A. The training process of the programme is deman?ding.   B. NASA encourages children to attend its pro?grammes.   C. Alyssa Carson will soon be sent to land on Mars.   D. The girl is being trained in Turkey at the mo?ment.14. What do we know about Alyssa Carson's father?   A. He is as passionate and dedicated to Mars as his daughter.，   B. He's never heard of anyone dreaming about' get?ting to Mars.   C. He's devoted his whole life to realizing his daughter's dream.   D. He's willing to do anything to support his daughter's dream.