单项选择题
Which of the following statements is not true （）
A．Some stamps have a flower or animal on one side. B．Along with a picture on one side, there are also some words. C．Some used stamps can be worth a lot of money. D．A stamp, when used, is worth more than a new on
单项选择题 Why is it useful to carry enough 25-cent coins with you （）
单项选择题 When you post a letter, you must buy ______ .
单项选择题 From the passage we know that joints and muscles perform best when（）
