非正品大黄较正品大黄致泻作用的（）明显增加。
参考答案：ED50
She bought the ring for ￥5000 three years ago, but now is it worth ____ the amount.
A．double more than
B．more double than
C．more than double
D．double than more
往复炉排点火时凡是没（）的炉排面上，都不要送风。
A、新煤
B、红火
C、灰渣
D、燃料
