题目

牙齿对动物的生存具有重要意义，生活在南极的海豹在冰下游泳时，隔一段时间就会用牙齿咬破坚冰，浮出水面呼吸空气，海豹牙齿的损坏即意味着死亡的来临。分析回答下列问题： （1）上图所示两类哺乳动物的牙齿类型，其中牛、马、羊、兔等哺乳动物具有的是图________所示的结构，它的特点是___________________，这与它们的__________生活是相适应的。从图中可以推断该动物消化管的特点是________________。 （2）马、牛、羊都属于哺乳动物，与兔一样， 阅读理解 　　On a one-acre site alongside many shrimp boats stands a ＄2.2 million assembly(组合体)of pipes, sheds, and humming machinery－a plant in Texas to make sea water suitable to drink． 　　The plant is an experimental project built as the former of the state’s ＄150 million, full-scale sea water desalination(脱盐)plant planned for construction in 2010． 　　Desalting sea water is expensive, mostly because of the energy required．The cost runs at about ＄650 per acre-foot, but it only costs ＄200 to purify(净化)the same amount of fresh water． 　　However, it is a growing field around the world as drinkable water becomes less and less in the earth． 　　About two-thirds of the world’s desalinated water is produced in Saudi Arabia, Kuwait, and North Africa．Perth, Australia, is looking to meet a third of its fresh water demand by removing salt from sea water． 　　In March, Israel showed off its plant at the Mediterranean port of Ashkelon that can process 87 million gallons of fresh water a day．Singapore opened a sea water desalination plant in 2005 hoping it will meet at least 10 percent of its water needs．Two months ago, General Electric Co．announced a ＄220 million contract to build a plant in South Africa． 　　Global output is still relatively minute－less than 0.1 percent of all drinking water．But according to a recent report by Global Water Intelligence, the worldwide desalination industry is expected to grow 140 percent over the next ten years, with ＄25 billion in investment by 2010, or ＄56 billion by 2015． (1) Which of the following statements is TRUE according to the passage? [　　] A． Some countries stopped desalinating sea water because it’s too expensive． B． Singapore is the only country that has put desalinating sea water into practice． C． Purifying fresh water is much cheaper than desalinating sea water． D． Desalinating sea water should be controlled by the government． (2) What is the passage mainly about? [　　] A． Many countries are trying to desalt sea water． B． How sea water is turned into fresh water． C． The present and future of desalting sea water． D． The world is in great need of fresh water． (3) The word “minute” underlined in the last paragraph most probably means “________”． [　　] A． exact B． close C． real D． tiny (4) The author’s attitude towards the desalination industry can be described as ________． [　　] A． pessimistic B． optimistic C． satisfied D． worried