本文作者： BY ROB GILBERT

VIP教师会员和本期电子版订户登录后下载

词数 220 建议阅读时间 5分钟 测试见7版LAST spring I was walking in a park. A short distance ahead of me was a mom and her 3-year-old daughter. The little girl was holding on to a string (细绳), which had a helium (氦气) balloon at the other end.