它的左右两个侧面的面积都是____cm²,前后两个面的面积都是____ cm²，上下两个底面的面积都是____cm²。由此可知，一个长方体的6个面可以分为____组，表面积是（ +  + ）× ＝____ cm²。

据《李鸿章传》记载，李鸿章因为洋务被天下世俗功利之人崇拜。下列企业中，与李鸿章被崇拜有关的是（    ）

①安庆内军械所    ②江南制造总局     ③汉阳铁厂    ④轮船招商局     ⑤湖北织布局

阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。

    Justin is a 16-year-old boy. He is thinking about how____(spend) his money during winter vacation. He ____(save) up about 300 dollars already. He plans to buy ____computer with his money but he also wants to go skating with his friends. He can't do both ____he doesn't have enough money. What should Justin do?

    We are often in these kinds of situations. You want to see a concert ____Saturday, but it is also your mother's birthday and you do not want to let____(she) down. In this case, you don't have enough time to go to both ____(place). You must make a decision. You must think about ____should be done first. You must consider the following questions ____(serious).

    ◆Which is more important?

    ◆Which decision needs my attention more?

    ◆Which choice would satisfy me more?

    After you've answered these questions, it may be much____(easy) for you to decide what to do. So the next time you must make a decision, remember to prioritize(优先考虑).

一组按规律排列的式子：a²， $\frac{a^4}{3}$ ， $\frac{a^6}{5}$ ， $\frac{a^8}{7}$ ，…，则第2017个式子是（   ）