观察下图,M商品的价格(X)与需求量(Y)之间的关系如图所示。在一般情况下,下列可能导致曲线D1向D2平移的是 ①M商品是大米,面粉价格下降 ②M商品是大米,面粉价格上升 ③M商品是汽车,汽油价格上涨 ④M商品是汽车,汽油价格下降
She wrote a month ago, ______ we’ve heard nothing.
Yesterday, Jane walked away from the discussion. Otherwise, she ______something she would regret later.
His health is ______improving. I'm sure he will come back to work soon.
My first _______ of him was that he was a kind and thoughtful young man.
As he _______ , he was surprised to see that the man had disappeared.