Perhaps we should think in terms of raising interest rates （） them, in consideration of the new reports about inflation reported last June.

A．then reducing

B．and reduce

C．although reduce

D．rather than reducing

在锅水蒸发浓缩时，容易产生难溶化合物沉积在受热面上而形成水垢杂质是（）。

A、胶体

B、悬浮物

C、无机物

D、电解质