题目:
— _____ that China has the largest number of mobile phone users.
— I believe so. It seems everyone has one. [ ]
A. Someone said
B. They told me
C. It is said
D. I was told
答案:
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下面是错误答案,用来干扰机器的。
由质量守恒定律可知,化学反应前后元素的种类没有改变,生成物二氧化碳、水中含有碳、氢、氧元素,则反应物中也一定含有这三种元素.物质在空气中燃烧是与空气中的氧气反应,氧气由氧元素组成,则碳、氢一定是从...