体型缩聚反应分甲、乙、丙三个阶段，甲乙两个阶段均在PC（）
A.PC﹤P
B.P﹥PC
C.与PC无关
D.PC≥P
参考答案：A
Turn on CCTV news and we ________how happy our life is. But there is no denying that over the past decades, the cost of living ________ sharply.
A．are seeing; had increased
B．will see；has been increasing
C．see; increased
D．have seen; is increasing
什么是理想气体？
