题目内容：

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Thirteen-year-old Shanna Wilkinson saved the life of Holly, a sheepdog, who was very young. Holly was a tiny and very weak dog. According to the vet, there was little chance that Holly could survive. But with Shanna’s love and care, Holly grew into a strong, healthy adult dog with a special skill that would save Shanna’s life more than once.

At seventeen, Shanna got a kind of illness. She began having seizures(疾病发作) repeatedly, often as many as nine times a day. Because she couldn’t predict when the seizures would occur, every moment was dangerous for her. Every day she was in danger--- it was risky for her to simply cross the street, much less drive a car.

Just when it seemed as if Shanna would have to live indoors forever, her mother noticed something strange happened. Several times a day, the dog would begin whimpering(呜咽) and pulling Shanna’s leg. At first, no one was sure what was wrong with her. But they soon realized that Holly’s strange behavior always occurred before one of Shanna’s seizures began. Amazingly, Holly is able to predict exactly when the seizures will occur, even though Shanna herself never sees them coming.

Luckily, no matter how mysterious the dog’s talent is, Holly’s help has made life a billion times better for her owner.

“I feel comfortable and safe going out in public, and I can know when my seizures will come because of Holly, ” Shanna says. “Holly has really given me back my independence and I can live a normal life.”

68. What do we learn about the dog Holly?

A. She can get recovered herself.

B. She is larger than most dogs.

C. She would have died without Shanna’s care.

D. She was fed well when Shanna saved her.

69. It was impossible for Shanna to driver a car because ___ .

A. she was too young to drive

B. she had no sense of direction

C. her seizures would come suddenly

D. she didn’t know the traffic rules

70. According to the passage, how does Holly help Shanna?

A. She can make Shanna know when the seizures come.

B. She can help Shanna by sending for a doctor.

C. She can stop Shanna from going out in public.

D. She can help Shanna when she gets injured.

71. The underlined word “them” in the third paragraph probably refers to ___ .

A. Shanna’s family                   B. Holly’s behaviors

C. Shanna’s actions                   D. Shanna’s seizures