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。
A
Please put your donation in this envelope, seal it, and hand it to the cabin crew. Thank you!
Please provide contact details if you would like to learn more about UNICEF (or visit：www. unicef. cn) ：
Name： ____
Contact email： ____
Mobile number： ____
“Change for Good” is an innovative partnership between UNICEF and the inter-national airline industry. Established in 1991, it is one of UNICEF’s best-known and longest-running partnerships. This project appeals to travelers to donate onboard the aircraft, to help UNICEF to improve the lives of poor children.
Hainan Airlines is the first airline company from mainland China to support this program. Since commencing operation (开航) in 1993, HNA has vigorously promoted the principle of “do something for the society, do something for others”. Hence, HNA actively bears the social responsibility, participates in social welfare and serves the society with gratitude.
We would like to call on everyone to join in this onboard fundraising to make this, world as best we can for children. We sincerely thank you for your generous support.
Change for Good*
21．How can you deal with your onboard donation?
A．Give it to an air hostess.
B．Provide your contact details.
C．Mail this envelope with donation.
D．Visit www. unicef. cn.
22．Which of the following is one of UNICEF’s best-known partnerships?
A．The project of “change for good”.
B．The international airline industry.
C．The staff of UNICEF.
D．Hainan Airlines.
23．According to the text, which of the following is true?
A．Everyone onboard the aircraft has to join in this program.
B．HNA is the only airline company to support the program.
C．HNA is willing to help UNICEF to raise money.
D．Hainan Airlines was established in 1991.
