（ ）情况下会触发ondragenter事件
A. 当源对象进入目标元素时触发
B. 当源对象悬停在目标元素上方时触发
C. 当源对象离开目标元素时触发
D. 当源对象在目标元素上方释放鼠标时触发
People's learning activities are possible because they ________
A. enjoy being rewarded for doing the right thing
B. know what is vital to the progress of society.
C. believe that emotions are fundamental for them to stay alive.
D. benefit from providing help and support to one another.
The economic foundation of society would be destroyed in an emotionless world since there would be no_____________
A. chances of making money.
B. willingness to work for pleasure.
C. incentives of any kind.
D. categorizations of our emotional experiences.
Emotions are significant for man's survival and adaptation because ________
A. they provide the means by which people view the size or shape of objects.
B. they are the basis for the social feeling of agreement by which society is maintained.
C. they encourage people to perform dangerous achievements.
D. they generate more love than hatred among people.
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