以前，由于粮食只能卖给粮站，因而存在人为压秤、多扣水杂等现象，致使粮价偏低。2004年4月，国家推行粮食购销体制改革，全面放开粮食市场，各种粮食经营企业进入市场同台竞技，推动了粮价上涨。这主要表明
| A．竞争必然导致价格上涨 |
| B．充分的竞争有利于价格反映商品价值和供求状况 |
| C．市场经济的开放性有利于资源优化配置 |
| D．国家不再垄断和过问粮食市场 |
相关试题
Some parents might worry that their children's hobbies can _______ schoolwork.
| A．get the way of | B．get on the way of |
| C．get on well with | D．get in the way of |
—________ you________ the Beatles' story?
— Yes. And their songs are popular.
| A．Did; hear | B．Do; listen to | C．Have;  heard of |
D．Have; listened to |
Your donation_________ and the money will be used to help the students from poor families.
| A．is greatly appreciating | B．appreciates |
| C．has appreciated | D．is greatly appreciated |
Each time tourists travel to Beijing, they_______ the Forbidden City.
| A．will be shown up | B．will be shown around |
| C．will show around | D．will show to |
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