UNIT 4ASTRONOMY:the science of the stars
全员探究：
1.h armful adj.有害的
It is ______to your health to drink too much.(过量喝酒对你的身体 有害)
Smoking is __________to one’s health.（吸烟对健康有害）
归纳拓展：
do…harm/do harm to___________ be harmless to _________________
do more harm than good ______________
Hot water will ________________the plant.(热水伤花草)
I have got up early all my life, and it hasn’t ____________________(对我并没 害处)
2.exist vi. ____________________
Man can’t ______without air.(没有空气人就 不能生存)
火星上有生命吗？___________________________________________?
拓展：存在 n.________________
bring…into existence ____________________
