A.Because it worked perfectly. |
B.Because the right booster was still OK. |
C.Because nothing serious happened then. |
D.Because fewer people died in the flight. |
A.their planes couldn’t fly high in the sky |
B.they gained much from experience in failure |
C.their planes were often checked by the experts |
D.they were unpopular among passengers |
A.show failure is a better teacher than success |
B.explain why Challenger failed |
C.introduce something about Prof Desai |
D.tell managers how to achieve success |