题干
—How was your weekend ?
—It_______ fine, thanks.
A：were
B：was
C：is
答案(点此获取答案解析）
B
—It_______ fine, thanks.
A：were
B：was
C：is
3Y(g)+Z(g)，混合气体中X的物质的量分数与温度关系如图所示：