第一部分：阅读理解（共15小题；每小题2分，满分30分）
阅读下列短文，从每题所给的四个选项（A、B、C、D）中，选出一个最佳选项，并在答题卡上将该项涂黑。
A
It all started at the beginning of fifth grade.At first,Carmen wasn't really sure what was happening.In class,she had to squint（眯眼）to see the blackboard clearly.As it got worse,she became more and more worried.It was important for her to see the notes and homework the teacher wrote on the board.
