问题
选择题
It's not _____ good idea to drive for four hours without _____ break.[ ]
A. a; a
B. the; the
C. a; the
D. the; a
答案
答案：A
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It's not _____ good idea to drive for four hours without _____ break.[ ]
A. a; a
B. the; the
C. a; the
D. the; a
答案：A
，这条光线离开棱镜时与界面的夹角为（ ）