题目内容

交感神经活动的生理意义有（）

A. 促进消化吸收及排泄功能
B. 调动器官的潜在能力适应环境的变化
C. 增强机体的战斗力，帮助机体度过难关
D. 保护机体，有利于休整恢复
E. 有利于生殖和繁衍后代.

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3.关于脑电波中的α 波，下列描述正确的有（）

A. 正常成年人安静、清醒和闭目时出现
B. α 波是大脑皮层处于清醒安静状态时的主要表现
C. α 波是大脑皮层处于紧张活动状态时的主要表现
D. 在睡眠和深度麻醉时可以出现
E. 婴儿时期常出现

Complete the following paragraph with key information from the text.Inspired by Paul Miller’s personal experiment of going one year with absolutely no _, the writer went on his own short . He did it because having been plugged in 24-7 for a decade, he wanted to see what would happen if he went for a while. So during his winter vacation to Mexico, he didn’t go except to check his email. As a result, he discovered that technology is evil and technology is already a(n) him now. Nevertheless, he also came to the conclusion that it is the _ of thoughtful articles and good books, _ snacky online content, that ________ the mind.

下列关于抽象类的说法错误的是（）

A. 抽象类可以实例化
B. 抽象类可以包含抽象方法
C. 抽象类可以包含抽象属性
D. 抽象类中可以包含普通方法

对场景“风吹藤动铜铃动”进行合理的抽象后，以下哪些选项不可以定义为对象？

A. 风
B. 藤
C. 铜铃
D. 动