–The boy is ______ than I.

To keep Chinese economy going on, the government has established an employment service system for _____ jobless urban residents, and for older laid-off and unemployed persons.

下列化学方程式正确的是（ )

若等腰三角形一腰上的高和另一腰的夹角为25°，则该三角形的一个底角为（   ）