You are supposed to write a composition on the topic Making Friends Selectively or Extensively? You should write about 120 words and base your writing on the outline given below:

1. 有些人认为应该有选择地交朋友

2. 另一些人认为应该广泛地交朋友

3. 你的看法

Making Friends Selectively or Extensively?

数学模型是随测量方法和测量程序的不同而不同的。