Little is known about the central Africa 200 years ago because ______.

Directions: For this part，you are allowed 30 minutes to write an essay with the title My View on Indoorsy Lifestyle. You are required to write at least 120 words，following the outline given below：

1.“宅”生活现象很普遍；

2.这种生活方式的利与弊；

3.你的观点。

My View on Indoorsy Lifestyle

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懂得与他人分享快乐很有必要。

我们现在最需要的不是承诺，而是行动。

骑自行车不仅环保，而且有益健康。

玛丽努力说服她的父亲戒烟。

她对那本书一无所知，我肯定她没有看过。

Violence and traffic accidents can leave people with terrible physical and emotional scars.Often they relive experiences in nightmares.

Sometimes men did keep a record of the most important happenings in their country ，but oftenit was destroyed by fire or in a war.

But if we had kept a book and had written in it an account of what we did each day, we shouldbe able to give an answer to the question.

Now I can totally resist the temptation of TV no matter how marvelous the programs are, andI’m entering into a new stage of life.