It is known that hydrogen _____ (be) the lightest element.
It is known that hydrogen _____ (be) the lightest element.
“The KaiCheng Stone Classics” is the most completed and lightest books in the world. （）
“The KaiCheng Stone Classics” is the most completed and lightest books in the world. （）
Among the main propulsion units on board the ship with the same capacity， the lightest one is（）.
Among the main propulsion units on board the ship with the same capacity， the lightest one is（）.
氢是已知的最轻的元素。Hydrogen is the lightest element________.?
氢是已知的最轻的元素。Hydrogen is the lightest element________.?
This box is ______ for me A: lightest enough, to carry B: B. light enough, to carry it C: C. light enough, to carry
This box is ______ for me A: lightest enough, to carry B: B. light enough, to carry it C: C. light enough, to carry
_____ is the first element on the periodic table, making it the lightest element. Since it is so light, it rises in the atmosphere and is therefore rarely found in its pure form.
_____ is the first element on the periodic table, making it the lightest element. Since it is so light, it rises in the atmosphere and is therefore rarely found in its pure form.
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