全文预览

人教版高一英语Unit 3单元测试题(附答案)

上传者:梦溪 |  格式:docx  |  页数:22 |  大小:298KB

文档介绍
rophyll, which gives leafy green plants their green color. Their main job is to absorb light from the sun. Chloroplasts can absorb every color except green. Light makes chlorophyll active. It creates an energy that separates water out into hydrogen and oxygen.  38  Hydrogen from the bines with carbon from the carbon dioxide we breathe out. Oxygen is sent out into the air.Р 39  Plants rely on the carbon dioxide that we breathe out, and we rely on the oxygen that they “breathe” out. This is one good reason for protecting plant life on Earth. Many plants can produce a constant supply of oxygen for us. We need plants in order to survive.РConservation (保护) projects around the globe are aimed at protecting our natural resources, including numerous species of plants.  40 РA. Plants are producers.

收藏

分享

举报
下载此文档