下面关于北京人的说法不正确的是?

1北京人一天生活，离不开许多种类的打制石器

3.北京人在炎热的夏季也只能穿兽皮衣服

谈论观点（Friendship）
Friendship is extremely important to me. It's like being brothers or sisters, but even more than that. I mean, I would do nearly anything for my friend,and I would expect that he would do the same for me. If he didn't help me when I was in need, then I would not consider him a good friend. I have a lot of different kinds of friends. Some are loud, others are shy. I prefer having a real variety of friends.

I think trust is the most important thing between friends.
The difference is attitude or mindset between adults and children making friend. In general, children like to make friend with good students because they can help each other in studying. But adults make friends with anyone they like.
日记
Today, I went to my mother’s office. My mother was very busy, so was my father. They always live in Beijing. They must get up early. Because they will manage the factory. So I k