People from all over the world make friends_____66____writing letters. One way to find a pen friend is to _____67____a club. International Pen Friends started in 1967 and has over 300,000members(成员) in different countries. Their____68___member is eight years old, and their oldest member is over 80. Some people write to find out about life in another country, ___69___want to practice their English, or enjoy their hobbies. Stamp collectors, for example, write to people in different countries ___70__that they can collect the stamps on the letters they receive. Most people just enjoy making friends, and they invite their pen friends to visit them.

增加区间占用逻辑检查功能后，CTC区间闭塞分区增加（）和“失去分路”两种表示。