单选题
The spacecraft {{U}}touched down{{/U}} on schedule and the astronauts were helped out of it.
A. launched
B. operated
C. landed
D. crashed
A
B
C
D
【正确答案】
C
【答案解析】
touch down：着陆；launch：发射，发动，掀起；operate：操作，手术，运行；land：着陆，找到；crash：坠毁
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