下图反映了当前市场上存在农民卖菜难与市民买菜贵的难题。能够缓解该难题的措施是　(　　)

①发布蔬菜供求信息,促进产销对接

②提高蔬菜种植补贴,扩大种植规模

③合理规划蔬菜流通,降低运输成本

④改善菜市场卫生环境,提高服务质量

A．①②

B．①③

C．②④

D．③④

Many Chinese students think science subjects are      foreign languages.

A．more difficult as

B．less difficult than

C．much difficult than

D．so difficult as