21.C.细节理解题。根据Summer Program部分中 An exceptional4- week program for students currently completing their study of high school.可知22.D.细节理解题。根据 Summer Courses部分 CCA offers about35for -credit- degree courses each summer, scheduled on the San Francisco and Oakland campuses.23.A.细节理解题。根据 Summer Start分中 During the program, you must live on CCA'ssan Francisco campus.可知24.B.细节理解题。根据第一段a1-year- -old swimmer with skyhigh- dreams and name to match them has broken record previously held by Olympian Michael Phelps. Clark Kent Apuada梦想远大,并且打破 Phelps的同期记录可知,他是很有前途的。