People are really on the beach in summer (夏季).A. relaxedB. relaxingC. relaxD. to relax

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(答案→)A. relaxed
B. relaxing
C. relax
D. to relax
解析：词义辨析。Relaxed放松的，指人；relaxing令人放松的，指物；relax放松；to relax放松。句意：夏季在海滩上人们真的很放松。故选A。
be relaxed表示放松的，休闲地。