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趣找答案
21.Whigh is a requirement of Project ECHO's competition?A.Relying on teamwork.B.Paying a fee for submission.C.Being at least in high school.D.Going to a summer program.22.Whd is most likely to win the Big Idea Competition?A.A student with wide knowledge.B.A student with excellent writing skills.C.A student with an original business idensD.A student with a creative research project.23.What is special about the last competition?A.It provides cash awards.B.It allows individual competitors.C.It accepts videos as submissions.D.It is open to a wider age range.