问题
选择题
I carried the bowl with both hands________, so that I wouldn’t break it.[ ]
A. carefully
B. happily
C. quickly
D. carelessly
答案
答案：A
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I carried the bowl with both hands________, so that I wouldn’t break it.[ ]
A. carefully
B. happily
C. quickly
D. carelessly
答案：A
，则两飞船相对速度的大小为().