子宫平滑肌能自发性收缩，催产素能促进子宫平滑肌收缩，利多卡因能抑制催产素的作用并减弱子宫平滑肌收缩，洗去药物后，平滑肌恢复正常收缩。为了验证催产素和利多卡因的上述作用，请根据以下材料，补全实验步骤，并进行分析讨论。

说明：实验材料充足，实验试剂浓度适宜，实验持续时间合理。

语法填空

    As I write this, I'm sitting on a bus back to Santiago in Chile where I am currently working____a language assistant. I've just spent the weekend in a city called La Serena north of Santiago. I was lucky enough to see the flowering desert, a natural phenomenon that ____(occur) around every five years here in the Atacama Desert.

    ____(follow) a particularly large amount of rainfall earlier, a____(vary) of flowers come into blossom. Bright purple flowers create ____ unbelievably beautiful scene at the base of the surrounding mountains.

    ____(catch) a glimpse of this magnificent treasure of nature, we took a bus from La Serena to a nearby town and then rented a car to go to the desert.____ we saw did not disappoint us, and as expected it was even more fascinating than the pictures we had seen online. The bloom was particularly ____(impress) this year due to the strong presence of El Niño (a band of warm water in the Pacific Ocean that changes the temperatures and increases the rainfall in certain areas). The vast carpet of colour ____ spread into the distance towards the contrasting green hills was ____(simple) breathtaking and deserved a large amount of photos! A real reminder of the beauty our planet can provide.

如图，正方形ABCD的边长为4，点E在对角线BD上，且∠BAE=22.5°，EF⊥AB，垂足为点F，则EF的长为（   ）

下列加线的字注音有误的一项是( )

在我国古代数学著作《九章算术》中记载了一道有趣的数学问题：“今有池方一丈，葭生其中央，出水一尺．引葭赴岸，适与岸齐．问水深、葭长备几何？”这个数学问题的意思是说：“有一个水池，水面是一个边长为 $1$ 丈（ $1$ 丈 $=10$ 尺）的正方形，在水池正中央长有一根芦苇，芦苇露出水面 $1$ 尺．如果把这根芦苇拉向岸边，它的顶端恰好到达岸边的水面．请问这个水池的深度和这根芦苇的长度各是多少？”设这个水池的深度是 $x$ 尺，根据题意，可列方程为____．