By the twentieth century, there have been many (invent) ____ for travel.
举一反三
- I travel to many places. I always bring my camera. A: When I bring my camera, I always travel to many places. B: I bring my camera everywhere I travel. C: Because I have my camera, I travel everywhere. D: Everywhere I travel, there are many places.
- If the foundations had not been reinforced in the twentieth century, the lean in the Leaning Tower (cause) ____its ruin.
- 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
- 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
- According to the interview, how many people have been added to the Earth’s population in the past century A: America. B: Australia. C: Asia. D: Europe.