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What Is Cancer Cancer is actually a group of many related diseases that all have to do with cells．Cells are the very small units that make up all (51) things，including the human body．There are billions of cells (52) each person’s body．Cancer happens when cells that are not normal grow (53) spread very fast．Normal body cells grow and divide and know when to stop growing．Over time，they also die. (54) these normal cells，cancer cells just continue to grow and divide out of control and don’t die．Cancer cells usually group together to form tumors(肿瘤)． A growing tumor becomes a lump of cancer cells (55) can destroy the normal cells around the (56) and damage the body’s healthy tissues．This can make someone very (57) Sometimes cancer cells break away from the original tumor and travel to other areas of the (58) where they keep growing and can go on to form new tumors．This is how cancer(59) The spread of a tumor to a new place in the body is(60) metastasis(转移)． People with cancer may feel pretty sick at times—but Call usually still do lots of normal things (61) they are very sick，kids and teenagers with cancer may still be able to go to school．They may be tired Or bruise(出现青肿)easily，but they (62) sometimes go to camp，movies，and sleepover(在外过夜的)parties．People with cancer still like the same things they did (63) they got sick． Cancer in kids is rare—but today, many kids who do get cancer go on living normal lives．The number of kids who beat cancer goes(64) every year because of new cancer treatments．So a lot of kids with cancer will some day drive cars，go to college，have careers，and even get (65) and have families of their own． 56（）
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判断并改正：贾德强调概括化的经验在学习迁移中具有决定性作用。
Step Back in Time Do you know that we live a lot longer now than the people who were born before us One hundred years ago the average woman 1ived to be 45．But now，she Can live until at least 80． One of the main reasons for people living longer is that we know how to look after ourselves better．We know which foods are good for US and what we have to eat to make sure our bodies get all the healthy things they need．We know why we sometimes get ill and what to do to get better again．And we know how important it is to do lots of exercise to keep our hearts beating healthily． But in order that we don’t slip back into bad habits，let’s have a look at what life was like 100 years ago． Families had between 15 and 20 children，athough many babies didn’t live long．Children suffered from lots of diseases，especially rickets(佝偻病)and scurvy(坏血病)，which are both caused by bad diets．This is because many families were very poor and not able to feed their children well． Really poor families who lived in crowded cities like London and Manchester often slept standing up, bending over a piece of string，because there was no room for them to lie down． People didn’t have fridges until the 1920s．They kept fresh food cold by storing it on windowsills(窗台板)，blocks of ice，or even burying it in the garden． Some children had to start work at the age of seven or eight lo earn money for their parents．If you had lived 100 years ago，you might well be selling matchsticks(火柴杆)(a job done by many children)or working with your dad by now． People now enjoy longer lives for unknown reasons．（）
讲chimpanzee黑猩猩的行为研究。 Conclusion of the passage:
第一篇 U．S．Blacks Hard-hit by Cancer Death rates for cancer are falling for all Americans，but black Americans are still more likely to die of cancer than whites，the American Cancer Society said Monday． In a special report on cancer and blacks．the organization said blacks are usually diagnosed with cancer later than whites．and they are more likely to die of the disease．This could be because of unequal(不平等的)access to medical care，because blacks are more likely to have other diseases as well，and perhaps because of differences in the biology(生物学) of the cancer itself, the report added． “In general，black Americans have less hope of surviving five years after diagnosis than whites for all cancer sites and all stages of diagnosis,”the report said． “In describing cancer statistics for black Americans，this report recognizes that many of the differences associated with race may be caused by unfair social and economic differences and unequal access to medical care．” The cancer society said blacks should be encouraged to get check—ups(体格检查)earlier, when cancer is more treatable，and it said more research is needed to see if biological differences play a role． “The new statistics emphasize the continuing importance of wiping out these unfair social differences through public policy and education efforts，”the organization said in a statement． But it also noted a drop in cancer death rates．“Cancer death rates in both sexes for all sites combined have dropped greatly among black Americans since 1992，as have incidence rates(发生率)，”said the report． Public policy and education efforts may help to do away with（）
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