第二节：语法填空（共10小题；每小题1.5分，满分15分）
仔细阅读下面的短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或用所给词的适当形式填空。答案写在答题卷上标号为31-40的对应位置。
The little “a” with a circle around it is most ____31_____(common) referred to as the “at” symbol, which is always found in email addresses.
Before it became the standard symbol for email, the @ symbol ___32____ (use) to represent the cost or weight of something by people. For instance, ____33___ you bought 6 apples, you might write it as 6 apples @ $1.10 each.
