A:keeping control of thoughts is very difficult
B:thinking is a kind of activity limited to humans
C:mammals evolved much more slowly than humans
D:mammals had poor awareness of dangers and opportunities
商鞅变法内容中,对秦国封建制度确立起决定作用的是( )
以下调查中,适宜采用抽样调查方式来收集数据的有( )
(1)检查一大批灯泡使用寿命的长短;
(2)了解石林县某中学七年级某班学生的身高情况;
(3)调查昆明市居民家庭收入状况;
(4)检查某种药品的疗效.