题干
31. The Tower of London is _____ the Church tower.
A：twice high tha
B：two times as high a
C：twice higher a
D：three times the height of
答案(点此获取答案解析）
D
A：twice high tha
B：two times as high a
C：twice higher a
D：three times the height of
O2↑+2H2O，试求反应物和生成物之间的质量比．