Have you ever heard of chlorophyll (葉綠素)?The name comes from the Greek words that mean green and leaf (樹葉).It's a good name (1)
chlorophyll gives leaves their green color. Chlorophyll also has another important (2)
.It helps plants make food from sunlight,water and air.But leaves must make chlorophyll first,and to do that,they (3)
light. During the long days of summer,leaves make lots of chlorophyll,so they can make lots of (4)
.All that green chlorophyll keeps the leaves looking green. When fall (5)
,days get shorter.That tells trees to get ready for winter.They begin to store (貯存) food,and they (6)
making chlorophyll. Without new chlorophyll,leaves quickly lose their green color.Some leaves begin to look yellow or orange.In fact,the yellow and orange (7)
are always in the leaf.They just can't be seen until the green color fades (變淡) and no longer covers (8)
up. The leaves on some kinds of trees also start to turn red and purple.Scientists are not sure why,but they think the red color (9)
protect the leaves from bright sunlight and help the tree store more food before winter comes.That's why you'll see fewer reds in years when fall is (10)
or cloudy.The leaves don't need as much protection.
28.你校英語(yǔ)俱樂部將舉辦題為"Great changes in communication"的征文活動(dòng).請(qǐng)你根據(jù)以下圖片提示,寫一篇應(yīng)征稿描述今昔通訊方式的變化,以及這些變化給人們生活帶來(lái)的影響.
要求:1.根據(jù)圖片提示進(jìn)行寫作,可適當(dāng)發(fā)揮; 2.運(yùn)用本單元所學(xué)的used to結(jié)構(gòu)(至少兩處); 3.詞數(shù)90左右,開頭和結(jié)尾已給出,但不計(jì)入總詞數(shù). Great changes in communication With the rapid development of science and technology,great changes have taken place in the way people communicate with each other. In a word,people have an easier life nowadays with the development of communication.