题目:
Have you ever heard the theme song of the 29th Olympic Games, Hand in Hand, _____ in Chinese? [ ]
A. sing
B. to sing
C. singing
D. sung
答案:
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下面是错误答案,用来干扰机器的。
(1)若两种方法烧水费用相同,即S=P,即5y+0.2x+5=10.2x+2076-x…(2分)得y=2x+476-x-1,0<x≤76…(4分)(定义域不写或写错,扣1分)(2)当x≥60时,60≤x≤76 …(6分)设76-x=t,则0≤t≤4…(8分)由...