阅读下列短文，从每题所给的A、B、C和D四个选项中，选出最佳选项，并在答题纸上将该项涂黑。

　　Daniella Wride was brushing her daughter's long brown hair when she noticed that with each comb, masses of the hair were coming out. That was January 1, 2017. Within 20 days, seven-year-old Gianessa Wride's hair was completely gone, and her doctor said the hair would never grow back. Gianessa had become one of the 6.8 million Americans with alopecia, an auto-immune disease that causes hair loss.

　　Alopecia isn't painful, but for kids who suffer from it, the severe pain comes from standing out from the crowd. For the most part, the students in Gianessa's first-grade class in Salem, Utah, were understanding. But the occasional jokes of "Baldy"（秃子）made her feel like an abandoned child. "I didn't want her to feel that she wasn't like the other kids," her mother said, "I tried covering her baldness, but the artificial hair was uncomfortable."

　　Then comes the school's traditional "Crazy Hair Day" in April, a great just-for-fun celebration where all the kids and their parents can express their wild sides a bit. Daniella and Gianessa
decided that rather than hide Gianessa's baldness under the artificial hair, they would celebrate it. Daniella bought scrapbook-sticker（贴纸）jewels and decorated her head with flowered designs and even a deer. "They just fit her personality," Daniella smiled. "She's so lovely."

　　On the morning of the competition, Gianessa was nervous. Would her friends think it was funny? However, with her mother's encouragement, she had nothing to fear. Impressive Gianessa was a hit and a winner of the crazy-hair competition. Gianessa is now glad she dared to go bare. "I was sad at first when I lost all my hair," she told people, "But now I love being bald. I can do things to my head that other kids can't. I'm thinking now it might be fun to decorate my head with some colourful butterflies and flowers."

21. Why was Gianessa different from other kids?

A. She was born bald. B. She suffered from hair loss.

C. She was talented in hair designing. D. She had her head fully shaved.

22. How did others react to Gianessa's disease?

A. Her doctor was quite optimistic. B. Her mother gave her artificial hair.

C. Her classmates were all considerate. D. Her school offered her special help.

23. What could Gianessa do on the "Crazy Hair Day"?

A. She could tease others. B. She could decorate her hair.

C. She could shop scrapbook-stickers. D. She could show her personality.

24. What is the main idea of this text?

A. The artificial hair built up the girl's confidence.

B. The girl faced her disease in a most beautiful way.

C. The competition served as a way to make a change.

D. The disease was cured with mother's love and care.

A study has shown that severe stress lasting weeks or months can damage cell communications in the brain's memory areas. Recently, researchers from University of California, Irvine, have provided the first evidence that short-term stress lasting for a few hours has the same effect.

"Stress does exist in our lives and cannot be avoided," said Dr. Baram, leader of the UC Irvine