回忆课文《夏夜多美》，填一填，读一读。

蜻蜓飞呀 呀飞，飞过____的假山，飞过____的草坪，飞到一座花坛前，小蚂蚁到家了。睡莲、蜻蜓和萤火虫把____送回家，____真美！

美不胜收的“双勾函数” $y=x+\frac{1}{x}$是一个对称轴不在坐标轴上的双曲线，它的渐近线分别是y轴和直线y=x，其离心率e=(    )

下列能反映相关实验过程中量的变化的图象是（   ）

根据短文理解，回答下列问题。
Cyber Boy   5-26-2013   2:15 pm
    Hi, I'm planning a trip to Europe this summer. I haven't decided where to go yet, but I'd like to experience Britain and France. And I don't want to spend too much money. Any ideas?
Esperanto   5-26-2013   2:23pm
     I had a tour to Britain last year. It's a very nice place. I had a great time there. If you get a chance, visit Stratford. That's the town where Shakespeare lived.
Yoshi   5-26-2013   2:28 pm
    First you should make sure what you want to do there. Each country in Europe has so much to see. Are you interested in museums and castles（城堡）? Or do you want to get to know anything modem?
Cyber Boy    5-26-2013   3:02 pm
    Yoshi -- Good question. I'd like to see some museums, but I also want to try some of French famous food, and a castle would also be great.
Yoshi   5-26-2013   3:21 pm
    I think an English-France-Germany trip might work well for you. You can do a little bit of everything. That's wonderful.
Esperanto   5-26-2013   3:38pm 
    It's easier to say than to do. It will need a lot of money and take time. Cyber Boy isn't so rich. I think he'd better go to France first this time and he is still able to travel to England or Germany in the future if possible.
Yoshi   5-26-2013   3:54pm
     Esperanto --That sounds OK. But I'm not sure if he will have another trip to Europe.

如图，6根钢管交接成六边形钢架ABCDEF，要使钢架稳定且不能活动，最少还需____ 根钢管．