Until the late nineteenth century,there was no uniform system of time-keeping in the United States.
A: personal
B: B．efficient
C: C．consistent
D: practical
A: personal
B: B．efficient
C: C．consistent
D: practical
举一反三
- Not until the dedication of Yellowstone Park in the late nineteenth century（）a national park. A: the United States had B: did the United States have C: when the United States had D: the United States having
- There are _____ states in the United States.
- The Constitution of the United States of America is the Supreme law of the United States.
- There are ______ states in the United States. A: 49 B: 50 C: 51 D: 52
- There are 50 stars on the national flag of the United States. They represent today's 50 States of the United States.