Hot metal ______ as it grows cooler.

Hot metal ______ as it grows cooler.
A、contracts
B、reduces
C、condenses
D、decreases
【正确答案】：A
【题目解析】：contract n.合同，v 收缩；reduce 减少；condense 使浓缩；decrease 减少句意：热金属一变冷就收缩。