已知i是虚数单位，计算 $\frac{\left(3-4i\right){\left(1+i\right)}^3}{4+3i}$ 的结果为____．

现有：①花生油②铅笔芯③水银④塑料盒⑤钢钥匙5种物品，其中属于导体的是____ ．（填序号）

阅读上面短文，然后判断句子正( A )误( B)。
     A man saw a boy standing beside a lake with a mirror (镜子).“Excuse me,” he said, “but could you tell me what you're doing?”
   “I'm fishing.”
   “With a mirror? Could you tell me how it works?”the man asked.
   “OK, but I want five dollars.”
     The man wanted to know the secret very much, so he handed the boy the money.“Now show me how it works,” he said. “Well”, the boy began, “you hold (拿) the mirror towards the water, and when a fish goes by, the sunlight in the mirror gives him a surprise. He stops and doesn't know what to do, and then you catch him at once. ”The man was surprised, “Can you really catch fish with the mirror? How many did you catch?”
   “You're the fifth today!” replied the boy.

下列属于青春期心理矛盾的有( )

①渴望独立与现实依赖的矛盾 ②心理闭锁与求得理解的矛盾 ③性机能发育成熟与身体外形急剧变化的矛盾 ④性发育迅速成熟与性心里相对幼稚的矛盾

为纪念中国历史上的一位杰出人物，孙中山曾写下诗句“中华开国五千年，神州轩辕自古传。创造指南针，平定蚩尤乱。”孙中山这段话歌颂的是（    ）