学习一段时间后要更换学习内容，目的是（） A．获得更多、_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

学习一段时间后要更换学习内容，目的是（　　）

A．获得更多、更全面的知识

B．勤于用脑，加强学习强度

C．防止大脑疲劳，提高学习效率

D．使思维更敏捷

答案

大脑是神经活动的最高级中枢，是进行思维的器官，科学用脑，讲究用脑卫生，能使我们保持旺盛的精力，提高学习和工作效率，科学合理的用脑，能使大脑的兴奋和抑制保持平衡，学习一段时间后要更换学习内容，目的是防止大脑疲劳，提高学习效率．

故选：C

完形填空

My 8-year-old son, Kevin, has made friends with some boys in the neighborhood. He has been      with them after school. My wife，Qugen, and I are       he has other kids to be with and we have      and encouraged him to play with his friends. We also want Kevin to learn    _，so we have asked him to tell us       he's going and to come home at a specified time.
The      started when Kevin didn't come home on time. On one occasion，I asked Kevin to be back at 6 pm. By 6：30，I needed to go       him. I found him at a friend's house，and he looked       that he couldn't continue playing. After we came home，I sat Kevin down for a talk about the       of keeping his word. I told him I was not worried about him arriving a few       late，but after half an hour，I’m going to be    . He told me he understood.
The next day，I came home from work at about 6:30 p.m. and Qugen asked me to go and get Kevin        she said he should be back home at 6. I walked to his friend's house and a look of     appeared on Kevin's face when he came to the door.
At     ，Qugen and I spoke to Kevin about why he didn't come home on time again. He said he just wanted to       playing. This was      ，so Qugen and I decided to ground(罚不准出门)him for a week. This      no playing with his friends.
For the next week，whenever his friends came to ask for Kevin，we let him       to them that he was grounded. We felt this would help him be responsible for his      .
As a      ，I believe one of the most important things we can teach our kids is self-responsibility and that actions have consequences.

B．communication

D．responsibility

A．looking for

C．waiting for

C．disappointed

B．disappointment

C．unacceptable

D．unbelievable

单项选择题

下列哪项病症易与肾阴虚相关（）

A.子肿

B.妊娠腹痛

C.子满

D.月经过多

E.绝经前后诸症