8. “It was the first time that US astronauts were sent into space from US soil after a nine-year gap.” No US astronauts have ever been sent into space before.
举一反三
- Astronauts are ________ to all kinds of tests before they are actually sent up in a spacecraft.
- Astronauts were ordered to abandon the International Space Station because _______.
- 学起: Space travel is dangerous and the astronauts in space have to ______ many discomforts (不适) in their rockets.
- The letter might have been sent to us ____. A: in an error B: by mistake C: by a chance D: in an accident
- the goods you sent us are