The surface of the earth may seem very stable to you.But you might be amazed if you knew some of the things that are going on un

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问题 The surface of the earth may seem very stable to you.But you might be amazed if you knew some of the things that are going on under that surface.
  The earth has an outer shell of rigid pieces called tectonic plates(地壳构造板块).The plates include both ocean f
According to the passage,the earth is_________.

选项 A、always changing
B、becoming smaller  
C、moving faster
D、getting hotter

答案A

解析 回答这个问题需要考虑全文:本文讲述了地壳板块构造的性质及板块移动所导致的三种相互作用:海脊、海沟以及转换断层。这三个例子充分说明地球表面由于板块作用而不稳固(unstable)、在不断变化(clranging),选项A正确。
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