【正文】
meat, but animals live on plants. If these were no plants, we should ha ve no animals and meat. So the soil is necessary for life. The top of ground is usually covered with grass or other plants. Plants grow in soil, which has a dark co lor. This dark soil is humus, dead leaves, dead plants and animal waste make it, but this takes a long time. When the humus has been made, plants can grow well in it. All soil needs food. If we don?t give it any, the plants will be weak. Animals waste is the best food for the soil, but chemical fertilizers (化肥 ) are also very useful. The same crop should not be grown in the same place every year。 The school ________ ________ in the ________ of the world. 。 Lesson 10 (課堂作業(yè)) river is ________________________(半米深) . mountain is ________________________( 648 米高) . is ___________________________(比我小兩歲) . is __________________________(數(shù)千公里遠(yuǎn)) . is over _____________________( 5, 000 年的歷史) . snow on the ground is ____________________(大約半米厚) . has many world records ________ its beautiful buildings and structures. has been a teacher ________ he was 18. Tai is located ________ Shandong province. has walked ________ two hours. Three Ges Dam will be finished ________2021.(到 2021 年為止 ) write ________ the words on the blackboard. 參考答案 I. a metre deep high years younger than me of kilometers away ,000 years old half a metre thick II.