Whats the main idea of the news item?A.The launching of the space shuttle Discovery has be
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Whats the main idea of the news item?
A.The launching of the space shuttle Discovery has been postponed.
B.The space shuttle Columbia has disappeared in a catastrophe.
C.NASA planned to lift off the space shuttle Discovery in May.
D.NASA scientists are concerned about space shuttle Columbia.
请帮忙给出正确答案和分析,谢谢!
