浏览器不支持音频Why is the trip to Mars a one-way trip?
A: The return trip is too expensive.
B: There is no technology to get people back.
C: People don't want to return.
D: The return trip is too risky.
A: The return trip is too expensive.
B: There is no technology to get people back.
C: People don't want to return.
D: The return trip is too risky.
举一反三
- This trip was not like his first ______ return home in 1990. (triumph)
- Why do they want to cancel the trip?
- Why does the woman want to cancel the trip?
- Pigeons have a natural instinct to return home, ____ they are very far away and the trip is hard or dangerous.
- 2. Why do they want to cancel the trip? A: Because they don’t have enough time. B: Because they don’t have enough money. C: Both A and