问题
选择题
Though today is bright, it __ be rainy tomorrow.[ ]
A. can
B. is
C. will
D. must
答案
答案：A
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Though today is bright, it __ be rainy tomorrow.[ ]
A. can
B. is
C. will
D. must
答案：A
C-H，则乙炔分子中存在2个σ键(C-H)和3个π键(C
C)