People with hemophilia can pass it to their children. Generally, the disorder affects only men and boys. It affects about one in every five thousand males. Women who carry the hemophilia gene are called carriers (携带者). Each son of a carrier has a fifty percent of having the disorder. Each daughter has a fifty percent chance of being a carrier.

　　About thirty percent of hemophilia cases are related to someone with no family history of the disorder. Scientists believe these cases result from changes in genetic material.

　　Experts also advise patients to stay active and exercise.

　　63. The passage is probably taken from _________.

　　A. an economic magazine

　　B. a TV program

　　C. a radio program

　　D. a book about hemophilia

　　64. Which of the following is TRUE about hemophilia?

　　A. it can’t be cured

　　B. It won’t be passed to a child by its parents.

　　C. people with it have protein which can stop the bleeding

　　D. It has a greater effect on females than on males.

　　65. People with hemophilia can do the following EXCEPT that ________.

　　A. ask doctors to give clotting factors to them in blood products

　　B. take part in some sports

　　C. take medicines to avoid passing hemophilia to children

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