18 We can conclude from this passage that _____.
(A) a stress-free life would be ideal
(B) an increase in heartbeat rate can only be caused by mental stress
(C) guilt is often self-induced
(D) worry is a more dangerous form of stress than is guilt
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統計: A(0), B(0), C(0), D(2), E(0) #3462257
統計: A(0), B(0), C(0), D(2), E(0) #3462257