Day or Night
练习内容
Up in the sky is the red, hot sun. The sun gives us light and keeps us warm.\nAt night, we cannot see the sun, but the sun is still there.\nWhy can't we see the sun at night? The Earth moves around th
Up in the sky is the red, hot sun. The sun gives us light and keeps us warm.\nAt night, we cannot see the sun, but the sun is still there.\nWhy can't we see the sun at night? The Earth moves around th