第 11 至 15 題為題組
        We all know that too much stress is not good for our health, but too little is not ideal, either.While __11__ stress can be dangerous to the body, short-term stress is actually healthy.
       Short-term stress triggers the production of protective chemicals in our body and strengthens thebody’s defenses. __12__ our body is in a vulnerable situation, a burst of stress will quickly mobilize thebody’s own repair system to defend the damaged areas. This __13__ us from physical discomfort andsickness. Small amounts of stress hormones may even sharpen our memory. A recent study found thatwhen rats were forced to swim—an activity that places them under stress for a short while—theyremembered their way through mazes far __14__ than rats that were in a relaxed state.
       The key to a healthy lifestyle is to keep our stress level __15__ . Too much stress will make uscranky and sick. Too little stress, on the other hand, will lead to boredom and low motivation.
【題組】11.
(A) contagious
(B) chronic
(C) diagnostic
(D) tedious