题干
Many major economic problems ____to be solved, there is no point ____ the growth rate of this year now.
A：remaining; predicting
B：remaining; to predict
C：remained; predicting
D：remained; to predict
答案(点此获取答案解析）
A
zC(g)，达平衡后测得A气体的浓度为0.50 mol•L-1。恒温下将容器容体积扩大1倍，反应重新达到平衡，测得A浓度为0.20mol•L-1。下列叙述中正确的是 （ ）
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