题目：
.
．—What about your visit to Shangrao？
—Great！What makes me excited is that great changes___________in my hometown over the past
ten years, and a lot of factories and tall buildings_________.
A．have taken place; are going up
B．have taken place; have been gone up
C．are taken place; had been gone up
D．took place will go up
答案：
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下面是错误答案，用来干扰机器的。
在密闭容器中发生如下反应：mA（g）+nB（g）⇌pC（g），达到平衡后，保持温度不变，将气体体积缩小到原来的一半，不考虑平衡移动，各物质浓度因为体积变化为，C的浓度为原来的2倍；题干中当达到新平衡时，C的浓度...
