履约保证金不得超过中标合同金额的（）。
A.5%
B.10%
C.15%
D.20%
参考答案：B
—He mentioned _____ his homework every right.
—Yes, everyone in our class hopes the teachers _____ us less homework to do. [ ]
A. that he spent a lot of time on, give
B. he spend much time in doing, to give us
C. he spent lots of time doing, to give us
实施计划生育基本国策的根本目的是( )。
A．发展经济
B．提高人民生活水平
C．促进国民健康
D．促进环境保护
E．促进人口、经济、社会、资源、环境协调发展和可持续发展
