一个长方形花坛长24米，宽18米，李军每天围绕花坛跑6圈，他每天要围着花坛跑多少米？
（24+18）×2×6=504（米）
防止振动危害的措施有哪些？
The old house is regarded as a part of local history, so it should be ________. [ ]
A. preserved
B. defeated
C. sheltered
D. deserved
