第6周homework 答案

第6周homework 1答案Have you ever felt lumps under the skin on the sides of your neck when you were sick? Those might be lymph nodes. 1.They can get swollen and painful but their job is to fight infection. Lymph nodes are part of the body's defenses known as the lymphatic system.2.This complex system throughout the body makes and transports a protective fluid called lymph.3.Lymph is made of white blood cells, proteins and fats.In a patient with breast cancer, the cancer can spread to the large number of lymph nodes under the arm. 4. Doctors have traditionally removed many of these lymph nodes in the hope of removing all the cancer.But the latest research finds nothing to gain by removing so many lymph nodes. Doctors have two choices when breast cancer starts to spread. They can do what is called a sentinel node biopsy. They remove the main growth and one or 2 lymph nodes nearest to it.5.Or they can take more aggressive action and remove a lot of lymph notes.6. But that can lead to shoulder pain and permanent swelling o f the arm.第6周homework 2答案Now the Earth Policy Institute in Washington has issued a bleak warning of the risk of environmental and economic 1. chaos. Its founder Lester Brown says a push towards sustainability could help. In fact, he says, it's essential. In this week's Global Business, Peter Day hears why.Lester Brown started life as a farmer in New Jersey, the Garden State in the USA. He got some hefty degrees, worked at home and abroad for the US Department of Agriculture, and then in 1974, he founded the World Watch Institute. It became well-known for its 2. annual state of the world reports on the global environment. Years ago when I had one of our 3. periodic chats at the World Watch Institute in Washington D.C., I remember a room decked with satellite maps of the world's watershed areas. Water is still an 4.abiding theme for Lester Brown in his newer role as founder and head of the Earth Policy Institute. It's another Washington D.C. think tank designed to provide a road map for building a 5.sustainable economy.But even after so many years on the environmental beach, there's a new urgency in what Lester Brown is saying in the book World on the Edge. As an agriculturist by training, he 6.focuses on food and the new threat of food scarcity caused by natural disasters,such as the Russian drought last summer, and 7.consequential flooding elsewhere, and increasing demand for many developing countries as well as the rich world.Lester Brown thinks 8.the world has to mobilize to embrace sustainability in the waythat much of the western world mobilized to fight the Second World War.第6周homework 3答案National standards for US schools gain supportAmericans have never had national education standards. Goals for what public schools should teach are set by state and local school boards. Their members are often elected. But some Americans say the lack of national standards is wrong in a competitive global economy. Former president Bill Clinton said it was as if somehow school boards "could legislate differences in algebra or math or reading."President George W. Bush and Congress expanded federal intervention. His education law, still in effect, required states to show yearly progress in student learning as measured by the states' own tests.1.Now, the Obama administration supports what are known as the Common Core State Standards. These were developed in a year-long process led by state governors and chief state school officers. Texas and Alaska were the only states not to take part.2.The standards are in two subject areas, English-language arts and mathematics. They establish goals for each year from kindergarten through grade twelve. The aim is for students to finish high school fully prepared for college and careers.The developers considered standards in other countries, along with almost one hundred thousand public comments.3. One way the Education Department is trying to persuade states is with money. States are competing to share in almost three and a half billion dollars as part of a school reform competition. They will earn extra points in the race to the top if they approve the standards by August second.States are trying to recover from the recession. There are concerns that some could accept the standards and then lack the money to follow them.The final standards were released June second. A new report say about half the states have approved them already.4. The Thomas B. Fordham Institute is an education group in Washington. It says the standards are clearer and stronger than those used in three-fourths of the states.But the comparison also found that existing English standards are "clearly stronger" in California, Indiana and the District of Columbia.States that approve the new standards have a right to add up to fifteen percent of their own. In California, the State Board of Education plans to vote on August second to accept or reject a new set of standards. These are based largely on the common core, but also existing California standards.第3, 4周homework 1译文你生病时有没有感觉到脖子两侧的肿块？那或许就是淋巴结。