79比____多1，比____少1。

下图中的各种设计，以能够减小压强为目的的是（   ）

任务型阅读

     My name is Chen Yang. I'm twelve years old. I'm a Chinese student.

     There are four people in my family—my father, my moth er, my brother and I. My father is a doctor at the City Central Hospital and my mother is a theatre manager. My brother is a student, too. He is thirteen. We are in the same school, but not in the same class.

I like English very much. I can speak a lot of English. I want to have an American pen friend. Let's be friends, OK? Please write to me. My address is No. 22 Middle Sc hool, Hunan, China. My email is Cheny @ hotmail. com.

阅读短文, 回答问题。

下列关于生物进化历程总趋势的叙述，不合理的是（    ）