D.move on

　　解析:选C。insist on表示“坚持做某事”，go on，keep on，move on都表示“继续做某事”，根据猎人的威胁应为坚持自己的要求。

　　20.A.excellent

　　B.correct

　　C.strict

　　D.exact

　　解析:选D。根据乌龟将原先的珍珠要回，可知是为了让猎人相信他会去找一个和原来的一模一样的珍珠。exact match意思为“一模一样，完全吻合”。

　　Ⅲ.阅读理解

　　(2012·厦门质量检查)Experts say that agriculture provides fourteen percent of the world’s greenhouse gas emissions each year.The gases released include carbon dioxide，a major cause of global warming.

　　Twenty-one nations around the world recently joined forces to better understand and prevent greenhouse gas emissions from farms.The Global Research Alliance on Agricultural Greenhouse Gases was launched at the United Nations conference on climate change.The meeting took place in Copenhagen，Denmark last month.

　　Agricultural experts blame a number of farm activities for producing greenhouse gases.For example，animal waste and cattle digestive systems release methane (甲烷，沼气) gas.Fertilized soil and the burning of crop waste also release harmful gases into the air.Experts say some methods of farming—turning the soil to prepare for planting—also release harmful carbon dioxide.

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