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。
A
Marty Verel, a 59-year-old kidney transplant patient in Ohio, should have been near the top of the list to receive a COVID-19 vaccine. Yet like millions of others, he wasn't having any luck. Marty and his wife, Nancy Verel, would sit with computers on their laps trying for hours to book an appointment on different sites, all of which were complex. “I felt hopeless,” Nancy says.
Then Nancy heard about Marla Zwinggi, a 40-year-old mom of three who was spending up to ten hours a day online trying to secure appointments for vulnerable (易受攻击的） individuals. So Nancy messaged Marla on Facebook: Can you help? Twenty-five minutes later, Marla responded by asking for Marty's legal name, date of birth, and other information. Nine minutes after that, Marla reported back-Marty had an appointment.
Marla's vaccine hunting started on February 1,when she learned that her parents-her father has leukemia(白血病） and her mother is a breast cancer survivor with a heart-condition-were unable to get appointments themselves. She hated that they had to wait. Clicking around on vaccine registration sites, Marla discovered just how difficult it was to book an appointment. “It was like trying to get a World Series ticket,” she says.
She applied strategies that web insiders are familiar with (keeping multiple browsers open, refreshing sites every 20 seconds, erasing cookies) and added a few of her special skills. “I'm determined. I drink a lot of coffee, and I'm a fast typer,” she says. Soon enough, Marla had secured appointments for her parents. “I felt like a rock star,” she says.
Marla decided that helping others would be her way of giving back. “I feel like I need to will us out of this pandemic (大流行病）” she says. On February 10, she logged on to Facebook to let people know that she was assisting with bookings. By March 2, she'd secured appointments for 400 seniors, a feat that made Nancy conclude, “Marla is some sort of COVID angel.”
21. Why did Nancy and Marty fail to make an appointment themselves?
A. They had no access to the websites.
B. Too many people applied at the same time.
C. They were not among the first seniors to be vaccinated.
D. The registration sites were too difficult for them.
22.What does the underlined word “feat” in the last paragraph refer to?
A. strategy. B. reward. C. achievement. D. service.
23.Which of the following words best describe Marla?
A. Helpful and skillful. B. Reliable and humorous.
C. Confident and generous. D. Ambitious and cooperative.
