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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． 62（）
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在总线式局域网的信道上有两个或更多设备同时发送帧，从而造成帧的重叠，这种现象称为_________。
English and English Community 1 There is no doubt that English is a useful language．The people who speak English today make up the largest speech community in the world with the exception of speakers of Chinese． 2 A speech community is similar to other kinds of communities．The people who make up the community share a common language．Often they live side by side, as they do in a neighborhood (街坊)，a village，or a city．More often they form a whole country．National boundaries，however，are not always the same as the boundaries of a speech community．A speech community is any group of people who speak the same language no matter where they happen to live． 3 We may say that anyone who speaks English belongs to the English speech community．For convenience(方便)，we may divide the speakers into two groups: one in which the speakers use English as their native language, the other in which the speakers 1earn English as a second language for the purpose of education，commerce，and so on． 4 Learning a second language extends one’s vision and expands the mind．The history and literature of a second language record the real and fictional(虚构的)lives of people and their culture；a knowledge of them adds to our ability to understand and to feel as they feel．Learning English as a second language provides another means of communication through which the window of the entire English speech community becomes a part of our heritage． Paragraph 1（）.
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． 61（）
美国人时间观念不强，赴约常常迟到，认为这是风度。
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