【Athree-year-oldboysavedhismum'slifebyusinghermobilephonetocallforhelp．Onemorning，AaronGreen，foundhismumCallyWootonlyingonthefloorofherbedroom，andwasnotabletowakeherup．Heimmediatelyturnedtohismum'sBla】
A three-year-old boy saved his mum's life by using her mobile phone to call for help．
One morning，Aaron Green，found his mum Cally Wooton lying on the floor of her bedroom，and was not able to wake her up．He immediately turned to his mum's Blackberry mobile phone on the bed，opened it，found the address book，and called his mum's grandmother，even though he had never been shown how to use the phone．Little Aaron told her：Mummy's sick，she's very ill．？
The grandmother called Cally's best friend Kara McCoy，who lived nearby．Kara ran to Cally's house．She found Cally was lying on the bedroom floor．She must have fallen off the bed．She was moving but wouldn't answer．Kara was scared．She didn't know what to do．She was helpless，so she called the ambulance（救护车）
Cally was sent to hospital and was found that she had a diabetic seizure（糖尿病发作）After five days in hospital，Cally was well again．
Aaron has just started learning his ABC．？Kara said，But he was very brave and calm．He did better than me．？
If it wasn't for Aaron，1wouldn't be here now．The doctors said 1was lucky to be alive．？the boy's mother said，“I don't know how he did it．It is not easy to use that phone．It feels like I must have been watched over by an angel who was guiding him through what to do．I want everyone to know what a Superman he is．”
46．What did Aaron do when he found his mum lying on the floor？___
A．He ran away at once．
B．He didn't know what to do．
C．He called his mum's grandmother．
D．He called his mum's best friend，Kara．
47．From the passage we know that．___
A．Cally was well the next day
B．Cally told his son to call for help
C．Cally's mother sent her to hospital
D．Cally's son saved her life by using her mobile phone
48．The underlined word in the passage refers to___
A．Cally
B．Kara
C．the doctor
D Cally's grandmother
49．This passag