某商场“五一”期间为进行有奖销售活动，设立了一个可以自由转动的转盘．商场规定：顾客购物100元以上就能获得一次转动转盘的机会，当转盘停止时，指针落在哪一区域就可以获得相应的奖品．下表是此次活动中的一组统计数据：

（1）完成上述表格；（结果全部精确到0.1）

（2）请估计当n很大时，频率将会接近　？，假如你去转动该转盘一次，你获得“可乐”的概率约是　？　；（结果全部精确到0.1）

（3）转盘中，表示“洗衣粉”区域的扇形的圆心角约是多少度？

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    Dear Adam,

    I'm on vacation in Central America and having a great time. I'm in Guatemala. It's a small country but there is so much to see and do! There are volcanoes (火山), mountains, rainforests, beaches and Mayan temples (玛雅寺庙) in the country.

    The Mayan people have a long and interesting history. They built many temples. Last Friday I visited a Mayan temple at a place called Tikal. The temple has a history of about 1,300 years. It is a wonderful place to visit.

    I am staying at Lake Atitlan now. Some people say it is the most beautiful lake in the world. It is a very big lake and there are mountains and volcanoes around it. You can walk around the lake and even climb to the top of a volcano.

    The volcanoes at Lake Atitlan are not active volcanoes (活火山), but tomorrow I am going to see an active volcano called Pacaya. Active volcanoes can be dangerous because they still erupt (爆发) sometimes. I want to climb Pacaya. It erupted in 2010. I hope it won't erupt when I' m there!

      I'll send (发送,) you another e-mail soon.

                                                      All the best,

                                                       Kate

给下列多音字选择正确的读音

埋头____（mái  mán）       埋怨____（mái  mán）

挣钱____（zhēng  zhèng）   挣扎____（zhēng  zhèng）

列举第一次工业革命中的两项交通工具。