What is the sky? Where is it? How high is it? What lives above it? These questions are difficult (1) , (2) they? Is the sky blue? The sky (3) no color. We know that there is air around (4) world. When planes fly, they need air (5) their wings. Planes can not fly very high because when they go higher, the air gets (6) If we go up about 1,200 kilometers (7) the earth, we find there is (8) air at all. Maybe we can answer (9) of our questions now. The sky is space. (10) space there is only the moon and all the stars.--优优班--学霸训练营

What is the sky? Where is it? How high is it? What lives above it? These questions are difficult   (1)  ,   (2)   they?

Is the sky blue?

The sky   (3)   no color. We know that there is air around   (4)   world. When planes fly, they need air   (5)   their wings. Planes can not fly very high because when they go higher, the air gets   (6)  If we go up about 1,200 kilometers   (7)   the earth, we find there is   (8)   air at all.

Maybe we can answer   (9)   of our questions now. The sky is space.   (10)   space there is only the moon and all the stars.

【考点】基础语法，科普环保类，固定搭配，词义辨析，逻辑推理

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难度：易

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