The United States Postal Service has a system to ensure its employees' safety句子中的关键词是:
举一反三
- The United States Postal Service charges for the service of Informed Delivery from the users.
- Postal service in some regions in the U.S. was suspended due to extreme cold weather句子中的关键词是:
- The United States has a national system of education. A: 对 B: 错
- The United States has a national system of education. A: 正确 B: 错误
- The system of higher education in the United States has two functions : teaching and research.