Hello, my name's Joe. I'm a pupil. I like cooking. I want to1a cook. I want to 2nice food for people. My father is a pilot. He flies a plane in the sky. He is not afraid of 3 My mother is a teacher. She 4Art. She 5good at painting. She can paint beautiful pictures.

阅读下列材料，回答问题。

材料一：   “为君之道，必须先存百姓，若损百姓以奉其身，犹割股以啖腹，腹饱而身毙。”“舟所以比人居，水所以比黎庶。水能载舟，亦能覆舟。”——唐太宗

材料二：   “忆昔开元全盛日,小邑犹藏万家室。稻米流脂粟米白，公私仓廪俱丰实。九州道路无豺狼，远行不劳吉日出。齐纨鲁缟车班班，男耕女桑不相失。”——唐·杜甫《忆昔》

这首诗非常讲究炼字。请自选一个字加以赏析。

（Ⅰ）求 $\frac{si{n}^{2}A+si{n}^{2}B}{si{n}^{2}C}$ 的值；

（Ⅱ）若tanA=2tanB，求sinA的值．