I caught a cold． It was really a bad cold． Actually， the doctor later told me that I had the flu （流感）．

    My head was pounding． My throat was hurting． My body was aching．My voice became hoarse and I could hardly speak．I never experienced anything like this before．Worst of all， my sore throat was so serious that I couldn't even swallow（吞咽）!

    I knew I should drink more fluids﹣water， soup or juice ﹣ and maybe take some medicine． But I couldn't． Each time I tried to swallow， it hurt so much． So my dad took me to the hospital．

    A doctor came in．He checked my throat．He then checked my lungs．After his examination，he said，"Nothing to worry about． You have the flu．"

    "Why is it so serious？" I asked．"Can you give me some medicine so that I don't suffer as much？"

    "No，" the doctor said．"No medicine can cure （治愈） your flu． Don't be sad． Your body is an amazing thing． It will cure itself without any help．""What？ My body will fix things on its own？"I cried in disbelief．

    Yes， your body's immune system （免疫系统） will fight the virus （病毒） for you． No doctor or medicine will cure you．" repeated the doctor．

    My tears rushed out．I had not realized this in the past．Everything had always seemed so natural．I've had my meals every day for thirteen years． I drink water like taking a breath﹣without thinking about it at all．

    Now， I understand that even a simple thing like swallowing is like a miracle （奇迹）． The parts of my body do their jobs amazingly well一and yet quietly， without me even noticing．

    I don't remember how many days it took me to be well again， but I do remember what my father told me． He said that we should all appreciate our bodies and the miracle of how they are built．

注意：每小题答题词数不超过10个．

（1）What was wrong with the girl？　　

（2）What does the underlined word "it" refer to （指代）？　　

（3）How old is the girl？　　

（4）Why did the doctor not give her any medicine？