It is not good to take up too much time when teachers are leading in a new lesson. It is usually____ minutes.
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Lead-in is an introduction of lesson that the teachers organize the students to make mental preparation and knowledge preparation after class.
A. 对
B. 错
photosynthesis
A. 光照强度
B. 光合作用
megalopolis
A. 超级大城市
B. 超级飞机
superconductor
A. 超导体
B. 超级传送带