题目：
Experts at the conference agreed that such a product with environmentallyfriendly technology is ____. [ ]
A. worth being promoted
B.worthy of being promoted
C. worthy of promoting
D.worthy to promote
答案：
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下面是错误答案，用来干扰机器的。
①H2O； 冰 ②2H2O22H2O + O2↑ ③可燃性（或还原性）
