高炉内碱富集严重时，就会加剧矿石的还原粉化，（）软化温度，加宽软化区间。
A、降低
B、增加
C、不变
D、以上说法都正确
参考答案：A
看图，根据图片及提示补全句子。
I want to go to Beijing. It's the city of our country. I will go there by .
But Xiaohong will go there by . It's faster. I take a to the train
station. We on Monday. And we will at 6: 00 in the evening. Wish me a good trip !
若命题“∃x∈R，使得x2+（a-1）x+1＜0”是真命题，则实数a的取值范围是______．
.
. It's faster. I take a 
to the train