话题:Talking About Material and Purpose
（一）掌握词汇
plant, water, grow, leaf, cover, itself, feed, look after, over, glass, energy, die, heat, nothing, bamboo, kilogram, pretty, hole, its, air, corn, wheat, furniture, medicine, ink
（二）重点词组和句型
grow into…, pass sb. sth., billions of, look after, be full of, keep…warm, be made of/ from, be important to, carry… away, make… from, make…into, half of, something new, look like, turn into, put… outside/ on/ into, in the sun, use… to do…, from… to…
