According to the passage, the fact that everything in an accident happens in slow motion occurs because______.
A. it is the result of the mind"s regulation
B. it is to delay people"s reactions
C. it is to accelerate the motion of the world
D. it is an illusion of the eyes
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If we find materials available only in faraway places, it can be inferred that______.
A. these materials were very popular at that time and sold in many places
B. these materials were very easy to produce and were made locally
C. people in this place were hunting tribes and traveled to distant places
D. these materials were probably got by means of traveling or trading
In the lecture, the professor talks about the benefits of the Louisiana Purchase. Indicate
生物性动机 源于学生自身好动、好奇或好胜的心理
社会性动机 指向于体育学习和锻炼活动的内容、方法或组织形式等
内部动机 为了在体育活动中与同伴接近、交往,得到认可、发展友谊等
外部动机 为了获得刺激、眩晕,运动愉快感觉和宣泄身心能力等
直接动机 由学生自身之外的诱因转化而来的
间接动机 指向与体育活动可能带来的生理、心理和社会的延迟等
According to the passage, which part of the earth did scientists focus their attention on
A. West Arctic.
B. East Antarctic.
C. West Antarctic.
D. The Arctic.