of liquids to different areas of his brain. The situation was so serious that doctors said they had to perform an emergency operation to remove the larva.

　　A doctor who operated on Ortiz told him he had only 30 minutes to live. When the doctor pulled the worm out of his head, it was still moving.

　　Luis Ortiz was a student at California State University in Sacramento. He began experiencing headaches in late August. But Ortiz said he did not think the headaches were serious.

　　In September, he visited a friend and his parents in another city. That is when the pain got worse. His mother saw Ortiz throwing up and took him to a hospital emergency room.

　　The doctors saved Ortiz's life. However, the surgery also affected him. Ortiz had to drop out of school and move back home. For now, he is not permitted to work or drive a vehicle.

　　The U．S.Centers for Disease Control and Prevention says the U．S.has about 1, 000 reported cases of tapeworms each year. The CDC adds that tapeworms are more common in developing countries with poor public health systems.

　　The best way to avoid a tapeworm infection (感染) is to wash fruits and vegetables. Also, make sure meat is cooked thoroughly. The CDC suggests cooking all meat to an internal temperature of at least 63 degrees Celsius.

　　语篇解读：本文介绍了一位叫Luis Ortiz的美国青年，因头痛难忍和呕吐而去医院就诊，医生惊奇地发现他的脑子里有一条绦虫幼虫。后来，医生的及时救治才挽救了他的性命。

3．What caused Luis Ortiz to feel sick and headaches?

　　A．Dirty food eaten in August.

　　B．Travelling for a long way.

　　C．A living creature in his brain.

　　D．Uncooked meat eaten by him.

　　解析：选C　细节理解题。根据第二段第二句中的"they were shocked to find a tapeworm larva (绦虫幼虫) in his brain"以及"The larva was still alive."可知，有一条活的绦虫幼虫在Luis Ortiz脑袋里，使他恶心难受。故选C。

4．If the doctors didn't have an emergency operation on him, Luis Ortiz was likely to ________.

　　A．die of cancer

　　B．live for only half an hour

　　C．finish studying in school

D．pass the driving test