在3Fe+2O₂═Fe₃O₄反应中，____ 　份质量的铁跟　____ 　份质量的氧气反应，生成　____ 　份质量的四氧化三铁．

Stay Fitness Club—the Club with a Difference

Get off the sofa! It's summer! Let's spring into action! We want to help you get fit and stay fit.

Join our fitness club and become a member. Then, you can enjoy our classes for free. You can enroll（注册） for as many classes manage.

We offer classes in:

Yoga

Indoor cycling

Dancing

Taekwondo

Chinese kong fu

We also have fantastic facilities（设施）：

Machines—They use the very latest technology.

Changing room—There are excellent showers and lockers to keep your things safe.

Lounge area—You can relax and enjoy a cooling drink and a healthy snack.

The membership fee（会费）is very low. You can pay weekly or monthly. It is up to you. When you have paid the fee, you can come as often as you want. Our friendly staff（工作人员）will be glad to answer your questions.

Come to Stay Fitness Club. You are never too old or too young to start a fitness programme.

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下面关于参照物的说法中，正确的是                     （   ）                                      

素养一：时空观念，是在特定的时间联系和空间联系中对事物进行观察、分析的观念。

分析下图：

素养二：历史理解，是指将史事的叙述提升为理解其意义的理性认识和情感取向。阅读材料：立足亚洲看日本，明治维新的成功是亚洲之幸也是亚洲之不幸，是（亚洲）黄色人种的骄傲也是灾难。

素养三：历史解释，是指以史料为依据，以历史理解为基础，对历史事物进行理性分析和客观评判的态度与能力。分析材料：罗斯福说：“德日把不帮助轴心国的一切民族和国家当作全体轴心国共同的敌人，这就是他们简单明确的总战略，所以，只有类似的总战略才能与之抗衡。”