Mark T or F. 判断下面的句子意思是否与短文内容相符。 A father asked his son, 'How many letters are there in the Alphabet (字母表)?' 'I'm sorry, I don't know.' answered his son. The father was very angry. He said to his son, 'You don't know? You are in school for many years and you don't know how many letters there are in the Alphabet?' 'No.' answered his son, 'But let me ask you a question, Dad. You often go to the post office. Now please tell me how many letters there are in the post office.' (     )1. The son didn't know the meaning of the word 'Alphabet'. (     )2. The father was angry because his son was not polite to him. (     )3. The son was too young to go to school, so he couldn't answer his father's question. (     )4. The father couldn't give the right answer to his son's question. (     )5. The word 'letter' has two meanings in English.