阅读《蜀道难》选段，完成小题。

    噫吁曦，危乎高哉！蜀道之难，难于上青天。蚕丛及鱼凫，开国何茫然。尔来四万八千岁，不与秦塞通人烟。西当太白有鸟道，可以横绝峨眉巅。地崩山摧壮士死，然后天梯石栈相钩连。上有六龙回日之高标，下有冲波逆折之回川。黄鹤之飞尚不得过，猿猱欲度愁攀援。青泥何盘盘，百步九折萦岩峦。扪参历井仰胁息，以手抚膺坐长叹。

    宋代，福建的桥梁、渡口等各项基础设施建设发展迅速。宋初，各级官吏就把驿站、驿馆的修建当作一项重要的工作，形成了八闽四通八达的驿道。为了增强交通的运行效率，宋代的人们修建了许多桥梁。泉州洛阳桥、福清龙江桥、晋江安平桥、龙海江东桥合称福建古代四大桥梁，是省内保存最完整的宋代石梁桥，还有莆田熙宁桥、延寿桥，也yùn含着丰富的科学技术。闽东、闽北、闽西的廊桥，也体现着天人合一的艺术造yì，是木构技术的登锋造极之作，展示了福建人民【A】（人工的精巧胜过天然，形容技艺十分巧妙）的工匠精神。

    I recently posted a picture on Facebook from the movie Mad Max, a film where two groups race through the desert in steampunk vehicles, and wrote, “Actual picture of my way to work today.” It was meant to be a joke because of the sandstorms in Beijing, but one of my friends from back home thought it was real.

    I couldn't imagine how they could think that is actually what China is like. China has so many more conveniences and advantages than the West, and many of my friends agree. “I don't know how I will be able to deal when I go back home,” said a friend who is about to end her gap year in Beijing. “I've become so spoiled in China.”

    China seems to be leading the way in innovation(创新) and convenience for daily life. Back home I could never shop, pull out my phone and scan a QR code to pay.

    There have been rumors of starting bike sharing in my hometown for years with little success while bike sharing suddenly appeared in Beijing overnight. I just step outside and scan a code, and I am on my way.

    Going out to eat with a group of friends back home was troublesome for both the group and the servers. Splitting bills and swiping(刷) 10 different cards or making change for each person in the group can be a pain. But with China's WeChat, you can quickly send your friends your part of the bill.

    The list goes on…

    When I first arrived in Beijing, I was dead set on leaving in a month. That month has come and gone. Now, when someone asks me when I'm coming back, I think to myself, “Who knows?”

    While my friends think I am riding through the desert on a motorbike, I am actually taking a Didi for what is the equivalent of $5 in the US.

    With all the conveniences and technology here, I may never want to go back.

两只相同的白炽灯L₁、L₂接到如图所示的电路中，灯L₁与电容器串联，灯L₂与电感器串联，当a、b处接电压最大值为U_m、频率为f的正弦交流电源时，两灯都发光，且亮度相同．更换一个新的正弦交流电源后灯L₁的亮度大于灯L₂的亮度，新电源的电压最大值和频率可能是(   )

钱理群《天地玄黄》记载某民国杂志刊登了一则“小品”：“法币满地，深可没胫，行人往来践踏，绝无俯身拾之者，谓之‘路不拾遗’，谁曰不宜！”小品所反映的“路不拾遗”情景最有可能出现在