As long as I can remember, ___________I called, his wife would answer the phone.
A:however
B:whenever
C:whatever
D:whichever
中共十八大提出:建设生态文明,是关系人民福祉、关乎民族未来的长远大计。要按照人口资源环境相均衡、经济社会生态效益相统一的原则,给子孙后代留下天蓝、地绿、水净的美好家园。
读下图,对本区农业资源的利用,下列方式合理的是( )