At a day care center in Texas，children were playing outside．One of the children was Jessica，18months old．Jessica's mother，who worked at the day care center，was watching the children．Suddenly Jessica fell and disappeared．Jessica's mother cried and ran to her．

A well was in the yard of the center．It was only eight inches across，and a rock always covered it．But children played around and had moved the rock．Jessica fell right into the well．

Jessica's mother couldn't feel Jessica，so she called 911for help．Men from the fire apartment arrived．They discovered that Jessica was about 20feet down in the well．

"It's too narrow，"they said，"So，we're going to drill（钻） a big hole beside．"The man began on Wednesday morning．Two days later，on Friday morning，they were still drilling，as they had to drill through the solid rock．

During her days in the well，Jessica sometimes called her mother．Sometimes she slept，sometimes she cried，and sometimes she sang．

All over the world people waited for the news of Jessica．They read about her in the newspapers and watched her rescue on TV．

At 8p．m．on Friday，the men finally reached Jessica and brought her up from the well．Jessica was dirty，hungry，thirsty and tired．Her foot and forehead was badly injured．But Jessica was alive．A doctor at the hospital said，"Jessica is lucky．She is young．She's not going to remember this very well．"

However，her parents，the rescuers，many other people around the world will not forget this．Later，one of the rescuers made a metal cover for the well．On the cover he wrote，"To Jessica，with love from all of us．"

46．Jessica fell into the well because___．

A．her mother was not watching her

B．the rock cover was moved away

C．Other children pushed her

D．she was too young to cross it

47．What the doctor said meant that___．

A．Jessica is lucky to have a good memory