（Ⅰ）求道路BE的长度；

（Ⅱ）求道路AB，AE长度之和的最大值．

    We all want to study well. But do you know how to1 better and make your study get a good result? We all know that Chinese students usually study hard for long hours. This is very good, but it doesn't2 a lot. If you want to study effectively, you must have enough sleep, enough food, enough rest and 3. Every day you need to go out for a walk or visit some friends or some places. It's good for your 4. When you return to your studies, your mind will be refreshed and you'll 5more and study better. Here take English learning as an example. First you make great progress and you feel6. Then your language study seems to stay the same and you may 7 it. This can last for days or even weeks,8 you needn't lose hope.

    At some time, your language study will not take9 big jump.10you get enough sleep, food, rest and exercise, studying English can be very effective and interesting.

    Don't drop it along the way. Learn slowly and you're sure to get a good result.

如图所示，L₁、L₂是两个规格不同的灯泡，当它们如图连接时，恰好都能正常发光，设电路两端的电压保持不变，现将变阻器的滑片P向右移动过程中L₁、L₂两灯泡亮度变化情况是（   ）

$△ABC$中，$\angle A={60}^{°},\angle A$的平分线$AD$交边$BC$于$D$，已知$AB=3$，且$\overrightarrow{AD}=\frac{1}{3}\overrightarrow{AC}+\lambda \overrightarrow{AB}\left(\lambda \in R\right)$，则$AD$的长为 (     )

在自然灾害中防灾、救灾的首要防救对象是（  ）