题目

阅读理解1. You will pay_______ if you want to stay in the English club for a year.    A. 2400 yuan      B. 600 yuan        C. 1200 yuan    D. 200 yuan2. One can get free examinations（检查）in Health Centre if he is_______.    A. 16                 B. 73                  C. 67                 D. 533. Which of the following is NOT true?    A. English lovers may enjoy some English films in Sunny English Club.    B. You can call 3801451 for advice if you want to keep fit.    C. You can go to any of the three places （2007•红桥区一模）在一段线路中有4个自动控制的常用开关JA，JB，JC，JD如图连接在一起．开关JA，JD能够闭合的概率都是0.7，开关JB，JC能够闭合的概率都是0.8．（1）求JB，JC所在线路能正常工作的概率；（2）计算这段线路能正常工作的概率．