Ⅰ 阅读理解(共20小题，每题2分，共计40分)
第一节 阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。
A
In Canada you can find dogs， cats， horses， etc． in almost every family． These are their pets． People love these pets and have them as their good friends． Before they keep them in their houses， they take them to animal hospitals to give them injections（注射） so that they won’t carry disease．
