阅读理解
    A trip to Paris is not complete without a visit to the Eiffel Tower. To get the most out of your visit, read our tips below:
    Visit at Night
    Riding up the Eiffel Tower at night and looking out over the streets of Paris, you'll see why Paris is known as the “City of Light”. At street level, the spotlights on the top of the Tower zoom across the Paris skyline, and the reflections of the Tower in the Seine are sights not to be missed.
    Purchase Your Ticket in Advance Online
    Bypass the long ticket lines at the Eiffel Tower by purchasing your ticket online from the Eiffel Tower website. You'll pick a time to visit, and then select whether to print out the ticket or display it on your phone or iPad, which is a convenient option if you buy your ticket in Paris without easy access to a printer.
    Don't Bring Valuable Objects with You
    Before entering the Eiffel Tower, your bags will be examined by a security officer. If an item you are carrying sets off the metal detector, the officer will take you away from the line for further inspection. We've stood in line for hours witnessing people who missed their chance to go up the Eiffel Tower.
Have Drinks and Snacks at the Eiffel Tower
    If you're like us, after an exciting trip to the Eiffel Tower, you'll be ready to rest your legs and have a relaxing snack and a drink in a Parisian cafe. Across the Seine in the Trocadero area, there are many elegant cafes. The atmosphere is great, but the prices are in the stratosphere (最高水平). Actually, the perfect place for common visitors to eat and drink is on the Eiffel Tower itself.

如图所示的四种家用电器中利用电能转化为热进行工作的是（   ）

阅读下列资料，分析回答问题：

资料1：一只失去雏鸟的美国红雀，总是给养鱼池边浮到水面张口求食的金鱼喂它捕来的昆虫，就像喂自己的雏鸟一样，一连喂了好几个星期．后来，美国红雀一飞到岸边，接着有很多金鱼会游过来张口等待．

资料2：猫捉老鼠是天经地义的事，然而有时却发现正在哺育后代的母猫也能接受并喂养刚出生的小老鼠，并不伤害它们．

2007年2月，中国首条“生态马路”在上海复兴路隧道建成，它运用了“光触媒”技术，在路面涂上一种光催化剂涂料，可将汽车尾气中45%的NO和CO转化成N₂和CO₂。下列对此反应的叙述中正确的是(　　).

$\sqrt[3]{27}$ － $\frac{\sqrt{2}\times \sqrt{6}}{\sqrt{3}}$ .