下列现象中,由地球自转产生的是( )
A:昼夜长短变化现象
B:昼夜更替现象
C:四季变化现象
D:太阳直射点在南北回归线之间移动现象
我国共有5个自治区,它们分别是( )
推进公民道德工程建设,弘扬真善美、贬斥假丑恶,这是推进文化强国建设的一个重要工程。下列做法能体现这一主题要求的是 ( )
As we know, his father is a very famous scientist in physics. But what you don't know is that he _______ as a farmer for five years.