在世博主题馆外壁有一面超大的“绿墙”，这也是世界上最大的生态绿化墙面。这面墙是将可回收的废塑料再利用变成植物容器，构建的立体花卉墙。总面积达5000余平方米，每年可吸收二氧化碳4吨。与玻璃墙相比可降温5℃，使空气清新、湿润。实现上海世博园区的“低碳排放”。
（1）“绿墙”能吸收二氧化碳是因为绿色植物能进行__________作用，从而保持园区内___________平衡；其反应式是：
a表示___________；b表示___________。
（2）“绿墙”与玻璃墙相比可降温5℃，使空气湿润，是因为绿色植物能进行________作用。
⑴ 光合作用 碳-----氧
叶绿体 氧气
⑵ 蒸腾作用
能吸收二氧化碳是植物的光合作用，绿色植物进行光合作用，不断消耗大气中的二氧化碳和制造氧气，维持整个生态系统的碳——氧平衡，光合作用的条件是光照，场所是叶绿体，能降低周围温度的是植物的蒸腾作用。
| When you first drift off into slumber, your eyes will roll about a bit, your temperature will drop slightly, your muscles will relax, and your breathing will become quite regular. Your brain waves slow down a bit, with the alpha rhythm predominating for the first few minutes. This is the first stage of sleep. For the next 30 minutes or so, you will drift down through Stage 2 and Stage 3. The lower your stage of sleep, the slower your brain waves will be. About 40-60 minutes after you lose consciousness, you will reach the last stage. Your brain waves will show the delta rhythm. You may think that you stay at this deep stage all the rest of the night, but that turns out not to be the case. About 80 minutes after you fall into slumber, your activity cycle will increase slightly. The delta rhythm will disappear, to be replaced by the activity pattern of brain waves. Your eyes will begin to dart around under your closed eyelids. This period of Rapid Eye Movements lasts for 8-15 minutes and is called REM sleep. During both light and deep sleep, the muscles in your body are relaxed but capable of movement. As you slip into REM sleep, a very odd thing occurs -- most of the voluntary muscles in your body become paralyzed. Although your brain shows very rapid bursts of neural activity during REM sleep, your body is incapable of moving. REM sleep is accompanied by extensive muscular inhibition. |
The first paragraph of this passage tells us about______.
A．the rhythms of brain waves
B．the daily activities of sleep
C．the stages of sleep in cycles
D．the daily activities in cycles