⑴After I get up, I brush my teeth.
⑵Before I have breakfast, I wash my face and hands.
⑶After I have breakfast, I walk to school.
⑷Before I have dinner, I do my homework.
⑸After dinner, I watch TV.
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如图是实验室制取气体常用的两套装置.
如图是某电场中的电场线,在该电场中有A、B两点,下列结论正确的是( )
在经常刮大风的海岛上,无翅或残翅的昆虫较多.产生这种现象的主要原因是( )