题目内容
A．boring B．practical C．exciting D．natural
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Nicola Waiters had time for the experiments_______________.
A．orB．ButC．andD．though
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 can 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.
第 51 题
A．UnlessB．IfC．AlthoughD．Before
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