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，并在答题卡上将该项涂黑。
A
If you haven't decided how to spend your summer, you may want to think about the possibility of participating in a summer program.
Virtual Experience: Harvard's High School Programs
If you’re wondering what college is like, Harvard offers online college programs just for high school students who are curious. Harvard's high school programs allow you to take real courses and earn college credit. Financial aid is available for qualifying students.
Virtual Experience: American University High School Summer Scholars
This multi-week, online program helps high school students pursue their interests in a variety of topics. Each online course is 1-credit hour. Rising sophomores, juniors, and seniors with a 3.0 GPA (Grade Points Average) can choose 1 course from 14 subjects-from Political Action and Public Policy to Oceanography and more.
Virtual Experience: Worcester Polytechnic Institute (WPI) - Frontiers Program
This online, summer program is designed for high school students entering their junior and senior years. Program participants are challenged to explore the outer limits of their knowledge in science, technology, engineering, and math (STEM) with current laboratory techniques and exploring unsolved problems across a wide range of disciplines.
Virtual/In-Person Opportunities: Immerse Education Programs
Immerse Education's summer programs offer in-person and online courses in a variety of subjects and take place throughout the United Kingdom and Australia. Students ages 11-18 from around the world get to learn on the campuses of Cambridge, Oxford, London and the University of Sydney.
21.Which program will you possibly choose if you are from a family on a tight budget?
A.Immerse Education Programs.
B.Harvard’s High School Programs.
C.American University High School Summer Scholars.
D.Worcester Polytechnic Institute (WPI) - Frontiers Program.
22.What do these four programs have in common?
A. They provide access to online learning.
B. They set academic requirements.
C. They offer participants college credits.
D. They take place in the United States.
23. Who is the text mainly intended for?
A. College staff.
C. Program organizers.
B. College students.
D. High school students.
