题文
选词填空。根据短文内容，用方框中所给的单词填空。
Both, inside, could, experiment, grown What is the greenhouse(温室)effect? Have you ever been inside agreenhouse, the allglass building where plants are 1 ?It's very warm, because the glass walls allow the sun's rays(光线)in but keep the heat
from getting out.
Think of the earth as being 2 a large green-house. The gases act like a greenhouse's glass walls-they keep the heat from getting out into space,and the earth stays warm.
Try,this easy 3 :Take two jars (大口瓶) and put a teaspoon of water in each jar. Put a lid (盖子)
on just one jar. Place __4 jars in a aunny place. After a few hours,check on the jars. You'll see that the
open jar hasn't changed,but the closed jar will be hot inside. What happened? The heat from the sun 5 not get out from the closed jar.
题型：未知 难度：其他题型
答案
1. grown 2. inside 3. experiment 4. both 5. could
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