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阅读理解C篇：
Do you have brown hair? Are you taller than other kids your age？These characteristics were decided before you were born. You got your traits from your parents.They passed their traits on to you through genes （基因）.
Genes carry codes （代码） for blue eyes or brown eyes. Genes say how tall you will get and what color hair you will have. You got half of your genes from your mother. You got half of your genes from your father. So you have your own set of genes. Each person gets different genes for each body part. That is why you look like but not exactly like your brother or sister.
A dominant （显性的）gene shows up most of the time. Brown eyes are dominant over blue eyes. A recessive （隐性的） gene shows up less often. Light hair comes from a recessive gene. Dark hair is more common. Look at the eye color and hair color of the people around you. You will see that this is true.
Genes help to make you who you are. But they don't tell the whole story. Your genes may help you to be fast and strong. But you still need to learn how to run or swim or skate well.
31. The underlined word"traits"in Paragraph1 means .
A. charactcristics
B. expericnces
C. achievements
D. possibilities
32. According to Paragraph 3, you can see most of the people around you have .
A. brown eyes with dark hair
B. brown eyes with light hair
C. blue eyes with dark hair
D. blue eyes with light hair
33. What is the passage mainly about?
A. Genes carry codes for eyes and hair.
B. Genes help to make you who you are.
C. Genes help you to be fast and strong.
D. Genes make brothers look similar.
解析：
31. A 词义猜测题，文中提到"They passed their traits on to you through genes"父母的traits通过基因遗传给后代，我们知道，通过基因遗传的是性状，所以traits应该是个性、显著的特点的意思，由此确定选择A。
32. A 推理判断题，文中提到"Brown eyes are dominant over blue eyes. Dark hair is more common"控制棕色眼睛性状的基因是显性基因，黑发更为普遍，由此我们可以知道众人中常见的性状是黑发，棕色的眼睛，选择A。
33. B 主旨大意题，文中提到"Genes help to make you who you are"基因使得你成为独一无二的，并且文章通篇都在介绍基因和性状之间的关系，由此确定答案为B。
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