地震发生时，会同时产生纵波和横波，纵波破坏力较小，但速度相对较快，横波破坏力较大但速度相对较慢。根据这一特性，地震预警系统可以提前数十秒对较远地区发出预警，为人们争取应对时间。材料蕴含的哲学道理是（ ）
| A．地震的成功预警来源于地震活动的规律性 |
| B．对事物因果联系的推测，提高了地震预警的预见性 |
| C．地震预警是一种客观的物质性活动，不受主观因素的制约 |
| D．认识地震规律的程度，决定着地震预警收到积极效果的程度 |
相关试题
He was about to go out for a walk _____ his teacher came to visit him.
| A．while | B．which | C．when | D．then |
.With no o
ne to ______ in such a frightening situation, she felt very helpless.
| A．turn on | B．turn off | C．turn around | D．turn to |
He began to take political science _________ only when he left school.
| A．strictly | B．truly | C．carefully | D．seriously |
. Yesterday I went to see him, _________ that he had gone abroad two days before.
| A．only to learn | B．to learn only | C．only learned | D．only learning |
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