2.The first non-natural colors were produced_____.
A: many centuries ago
B: in the nineteenth century
C: in the twentieth century
D: only recently
A: many centuries ago
B: in the nineteenth century
C: in the twentieth century
D: only recently
举一反三
- The first non-natural colors were produced _________. A: many centuries ago B: in the 19th century C: in the 20th century D: only recently
- In what century did Walt Whitman live? A: eighteenth B: nineteenth C: twentieth D: seventeenth
- Business cards are likely to have appeared A: at the beginning of nineteenth century B: at the beginning of twentieth century C: before the nineteenth-century D: after World War I
- By the twentieth century, there have been many (invent) ____ for travel.
- __The system of drains in a medieval city was better than those of many nineteenth century cities.