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 {{U}} {{U}} 1
{{/U}} {{/U}}things, including the human body. There are billions of cells
{{U}} {{U}} 2 {{/U}} {{/U}}each person's body. Cancer happens
when cells that are not normal grow {{U}} {{U}} 3 {{/U}}
{{/U}}spread very fast. Normal body cells grow and divide and know when to stop
growing. Over time, they also die. {{U}} {{U}} 4 {{/U}}
{{/U}}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 {{U}}
{{U}} 5 {{/U}} {{/U}}can destroy the normal cells around the
{{U}} {{U}} 6 {{/U}} {{/U}}and damage the body's healthy
tissues. This can make someone very {{U}} {{U}} 7 {{/U}}
{{/U}}. Sometimes cancer cells break away from the original tumor
and travel to other areas of the {{U}} {{U}} 8 {{/U}} {{/U}},
where they keep growing and can go on to form new tumors. This is how cancer
{{U}} {{U}} 9 {{/U}} {{/U}}. The spread of a tumor to a new
place in the body is {{U}} {{U}} 10 {{/U}} {{/U}}metastasis
(转移). People with cancer may feel pretty sick at times—but can
usually still do lots of normal things. {{U}} {{U}} 11 {{/U}}
{{/U}}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 {{U}}
{{U}} 12 {{/U}} {{/U}}sometimes go to camp, movies, and sleepover
(在外过夜的) parties. People with cancer still like the same things they did
{{U}} {{U}} 13 {{/U}} {{/U}}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 {{U}} {{U}}
14 {{/U}} {{/U}}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 {{U}} {{U}} 15 {{/U}} {{/U}}and have families of their
own.
单选题
A. living
B. nice
C. big
D. whole
【正确答案】
A
【答案解析】[解析] 众所周知，细胞是构成所有生物的极小单位，故选A项。
单选题
A. by
B. in
C. with
D. at
【正确答案】
B
【答案解析】[解析] 表示“在每个人的体内”，介词应用in，故选B项。
单选题
A. or
B. but
C. and
D. though
【正确答案】
C
【答案解析】[解析] 句子中的“grow”与“spread”应当是并列关系，故选C项。
单选题
A. Unlike
B. Like
C. After
D. Without
【正确答案】
A
【答案解析】[解析] 根据上下文，癌细胞与正常细胞不一样，因此应选A项。
单选题
A. who
B. what
C. where
D. which
【正确答案】
D
【答案解析】[解析] 空格后面跟的是一个定语从句，前面是“a lump of cancer cells”，因此只能选D项which。