梁启超的《王荆公》是20世纪评议王安石及其新法影响最为持久的著作。梁启超称王安石“三代下求完人，惟公庶足以当之矣”，其改革措施中看作近代“文明国家”的银行，“与今世所谓警察者正相类”。其中涉及的内容有

①青苗法        ②市易法         ③保甲法          ④农田水利法

A．①②③④

B．②③④

C．①③④

D．①②④

A lifeboat is weight tested by lowering to near the waterand loading to capacity with weight evenly distributed. Itis then lowered into the water and released. This test mustbe done at least once every（）.

A.6 months

B.12 months

C.18 months

D.24 months