问题
选择题
As _____ announced in today's papers, the Shanghai Export Commoditiser Fair is also open on Sunday.
A．being
B．is
C．to be
D．been
答案
答案：B
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As _____ announced in today's papers, the Shanghai Export Commoditiser Fair is also open on Sunday.
A．being
B．is
C．to be
D．been
答案：B
时，温差△t指的是（）。