21. Why does the author suggest adding volunteer work？
A. To show you have a variety of interests.
B. To prove you are always ready to help others.
C. To provide details to make yourself better known.
D. To pretend that you have rich professional experience.
22. What should be done as to your experience？
A. Show your important influence before.
B. Give a detailed description of your job.
C. List how many organizations you work with.
D. Provide what your professional images are.
23. What is necessary to do when preparing a resume？
A. Your name and contact information.
B. Your excellent professional experience.
C. The education you have received.
D. The skills you have recently gained.
Two retirees. EJ Brandt and David Benscoter in the United States have found ten apple varieties that many scientists thought had died out. The two learned about the results of their hard work from experts at the Temperate Orchard Conservancy in Oregon where all the apples were sent for study.