填空。

 《盲孩子和他的影子》的体裁是____，作者____。文章从“影子”“萤火虫”对盲孩子的关爱、帮助中，概括出____这一主题。

2009国际天文年是由国际天文学联合会和联合国教科文组织发起的全球性活动，希望通过天文观察，激发个人的探索发现精神。图为我国某地二分二至日的日落时刻（北京时间）及方位图，读图回答下列各题。

（Ⅰ）求f（x）的解析式；

（Ⅱ）已知f（ $\frac{a}{2}$ + $\frac{\pi }{12}$ ）= $\frac{10}{13}$ ，﹣ $\frac{\pi }{2}$ ＜a＜0，求cos（a﹣ $\frac{3\pi }{4}$ ）的值．

    Those who are in love really know each other's thoughts and can see into one another's ice cream bowl.This truth became so clear to me the other day.

    At about 11:00 a.m.,my husband Gary called from work to see what was up at home."Oh nothing,"I said,"just having a little early lunch."Then he said,"So how's the coffee ice cream I bought?"I could almost "hear" him smiling.

    "What?"I was stunned.How in the world did he know I was eating ice cream?I never eat the ice cream, especially in the morning.Besides,he knows that I had been trying to diet again.However,I could hardly hide the laughter in my voice as I calmly asked,"Why would you think I'm eating coffee ice cream?"

    Gary said,"Uh...first,you said 'Just having a little early lunch' in a guilty,high voice.Second,your tongue must be rather cold because your words were a bit slow."What he said made me laugh out loud."The other thing is,I noticed you left some coffee ice cream untouched last night.That was like me hiding some cigarettes in the corner to enjoy later."

    We laughed long and hard together before he asked me gently,"What happened?Er...something must have happened to make you eat ice cream before lunch."

    Suddenly,I felt a rush of love for the man on the other end of the line.He knew me well-cared enough to find out what was bothering me,and trusted me enough to help me laugh at myself.