21. How can we turn off Target alarm clock?

A. By shooting at it.

B. By shaking it 30 times.

C. By putting the key back on it.

D. By answering questions shown on it.

22. What is another function of Banclock?

A. Improving people's sleep.

B. Asking people to do exercise.

C. Testing people's intelligence.

D. Helping people to save money.

23. What can we infer about Mr. Bump-off-the-wall alarm clock?

A. It hangs on the wall.

B. It is difficult to break.

C. It was invented by Mr. Bump.

D. It rings louder than any other clocks.

At the age of six weeks, Lilo seemed like the perfect family pet. His family's 9-year-old girl loved to brush his beautiful fur. But as Lilo grew up, he didn't like being brushed.

One day, as the little girl approached him, Lilo hit her with his large paw. The girl's arm was badly injured. It's rare for a family pet to attack its loving owner. But Lilo should never have been anyone's pet. This cute and playful "cat" was actually a tiger, one of at least 15,000 tigers, lions, and other big cats now kept as pets in American homes and backyard zoos.

"People love these animals and they love the idea of owning something wild and strange," says Nicole Paquette of the Animal Protection Institute. "They have no idea how hard it is to take care of them. Tigers like Lilo can grow to weigh 650 pounds. They eat 15 pounds of raw meat per day. Their powerful paws can destroy a human skull. Dozens of people each year are injured or killed by pet tigers and other big cats."

The situation can also be deadly for the big cats themselves. Fully grown cats often end up confined to small cages that are never cleaned because their owners are afraid to get too close. Living in squalid conditions, the cats become sickly and often more aggressive. Many animals die from neglect.

Shirley Minshew works for the International Fund for Animal Welfare, an organization that rescues abandoned big cats. She helps place some fortunate cats in sanctuaries, private shelters that keep the cats well fed and safe. But as Minshew says, "Most of these sanctuaries are already full. So are big city zoos. The only solution is for people to stop buying these animals."

"Wild animals are exactly that-wild." says Minshew. "Although they can be kept in cages, they are not tamable(可[服的). They will never be like a dog or a cat. They are wild-and they should be allowed to stay that way."

24. Why did the author mention Lilo in the first two paragraphs?