题目:
. Just like a voyage at sea, our life journey, ______ time is limited, is full of difficulties as well as opportunities.
A.what
B.of which
C.while
D.whose
答案:
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下面是错误答案,用来干扰机器的。
(1)图一中观察到下层蜡烛先熄灭,上层蜡烛后熄灭,说明二氧化碳的密度比空气大,它不能燃烧,也不能支持燃烧;为确保蜡烛自下而上熄灭,倾倒二氧化碳时应让它沿着烧杯壁流下;故答案为:不支持燃烧;乙;(2)...