A

Online master gardener programs allow you to learn more about plants and gardening. Some of them can also provide certification to those who wish to benefit their community in broader ways.

Advanced Permaculture Design

*Price: About $495(Plus $60 registration free).

*Experience Level: Suitable for experienced learners.

*Reasons: If you are looking for something more in-depth, then these courses offer more advanced instruction in permaculture.

*Advantages: Opportunity to advance skills in permaculture; aid in professional development.

*Disadvantages: Not suitable for beginners.

Garden Tutor

*Price: Free.

*Experience Level: Suitable for beginners.

*Reasons: This course is free and it is suitable for beginners.

* Advantages: Completely free of charge; suitable for complete learners.

*Disadvantages: No route to certification; simpler and less comprehensive than paid courses.

Cornell Gardener Program

*Price: About $675 for a six-week organic gardening course.

*Experience Level: Suitable for beginners through to more experienced gardeners.

*Reasons: This is one of our top picks because of the institution's excellent reputation.

*Advantages: Focus on organic, eco-friendly gardening, flexible online learning; small class sizes.

*Disadvantages: Costly option; full master gardener certification only available to local residents.

Skillshare Gardening Courses

*Price: Low prices which vary in courses.

*Experience Level: Suitable for beginners.

*Reasons: These courses offer various opportunities to learn more about gardening. If gardening is a hobby, taking one or more of them could be a great alternative to a full master gardener program.

*Advantages: Affordable; flexible online schedules.

*Disadvantages: No route to certification.

21. Which of the following online programs charges nothing?

A. Advanced Permaculture Design.      B. Garden Tutor.

C. Cornell Gardener Program.          D. Skillshare Gardening Courses.

22. What makes Cornell Gardener program different from others?

A. It only offers a short-term course.           B. It doesn't charge any registration fee.

C. It is known for environmental protection.     D. It is intended for learners of different levels.

23. What may Skillshare Gardening Courses attract beginners most?

A. Its flexible schedule.     B. Its route to certification.

C. Its teaching method.      D. Its experienced masters.