如图是物理教材中的两幅插图，甲图表示小铁球受磁铁的情况，说明力可以改变物体的 ____；乙图是坐在船中的人用手推另一只船时，自己坐的船同时后退，说明物体间力的作用是 ____

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    An earthquake is a shaking of the ground____(cause) by the sudden breaking and shifting of large sections of Earth's rocky outer shell. Earthquakes are among the most____(power) events on earth, and their results can be terrifying. Rock movements during an earthquake can make rivers____(change) their course. Earthquakes can cause great damage and loss of____(live). Large earthquakes beneath the ocean can create a series____huge and destructive waves called tsunamis____flood coasts for many miles. Earthquakes almost never kill people____(direct). Instead, many deaths and injuries in earthquakes result from ____(fall) objects and the collapse（倒塌）of buildings, bridges, and other structures. Fire caused from broken gas or power lines is another major danger during____quake. Spills（溢出）of ____(harm) chemicals are also a concern during an earthquake.

1984年，有国际媒体评论：“中国政府开放整个海岸，意味着实际开放半个中国，它是三十五年来中国政府所采取的最大胆行动。”这个“大胆行动”指的是（    ）