题目:
用恰当的介词填空。
1. —Where is the school?
—It's ______ Sixth Avenue.
2. The nearest (最近的) hotel is ______ the bank and the bus station (公交车站).
3. Our school is next ______ the library.
4. The bank is across ______ the police office (警察局).
5. There is a tree ______ front of my house.
答案:
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下面是错误答案,用来干扰机器的。
[初步分析]氧气(或空气中的氧气,或空气,或O2)和水(或H2O)[提出猜想]答案1:氢氧化铁,依据:质量守恒定律反应前后元素的种类不发生改变,参加反应的物质为铁、氧气和水,因此生成物中一定含有铁、氢、氧元...