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Earthquakes, volcanic eruptions, tsunami are the manifestations of the incessant energy within the internal earth.（）

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在狭义相对论中，下列说法中哪些是正确的（）惯性系中的观察者观察一个与他作匀速直线运动的时钟时，会看到这时钟比与他相对静止的相同的时钟走得慢些

In the listening skills section, there are four skills introduced, which are enough for us to improve our listening ability.（）

元素为1或-1的三阶行列式能取到的最大值是（）

The pronunciation, intonation and listening skills sections are explained in Chinese.Easily confused words are explained in English.（）