Silent and Deadly
    1.题目：Which of the following is NOT true of ministrokes？
    答案：A）The cause of them remains unidentified.
    2.题目：To prevent ministrokes from turning into major strokes， it is important to
    答案：C）seek prompt medical treatment.
    3.题目：The passage indicates that the symptoms of ministrokes
    答案：B）are frequently hard to recognize.
    4.题目：All of the following may be signs of ministrokes EXCEPT for
    答案：D）severe headache caused by external injury.
    5.题目：It can be inferred from the passage that ministrokes are
    答案：B）silent and deadly.
    速记口诀：
    无症状的却致命的
    1.原因未明不正确____________________
    2.及时治疗很重要____________________
    3.小卒症状难辨别____________________
    4.外伤头痛要排除____________________
    5.小卒无声但致命____________________