提醒:於閱讀中您可以使用下表中的學習資源查詢您於閱讀中所想多了解的字彙或是您認為對閱讀該段落重要的單字。
The Earth has
been kept fairly safe for the last 65 million years by good fortune and the
massive gravitational field of the planet Jupiter. Our cosmic guardian, with
its stable circular orbit far from the sun, sweeps up and scatters away most of
the dangerous comets and asteroids which might cross Earth’s orbit. After the
Chelyabinsk meteorite, scientists are now monitoring potential hazards even
more carefully but, as far as they know, there is no danger in the foreseeable
future.
Types of space rocks
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恭喜你完成了第三部分的閱讀!!
記住千萬還不要將平板關閉或合起來唷,現在請你舉手,講台老師看到後便會前往你的位置,幫你將螢幕錄影功能關閉,並收取你的紙本資料與平板!
謝謝您這次的研究參與!