直接服务按服务价格由提供服务方直接与接受服务方结算，实行服务与受服务单位之间互为约束的（）结算，构成横向结算关系，真正体现为谁服务谁支付费用。

Americans use more water than any other people in the world. If we continue to use water at the rate we do now, we will soon not have enough to meet our needs. In 1980, 40 billion gallons were used each day in the United States. In 1990, 700 billion gallons were used. The average Americans uses almost 90 gallons of water a day for personal use. And much move water is needed to make the things American people like to have. For example, it takes thousands of gallons of water to make one pound of beef for the dinner table. It takes more than 100,000 gallons of water to make a car. If we include these uses of water, the average American uses about 2000 gallons of water a day.

It takes ______ water to make a car than to make one pound beef.

A．much

B．more

C．less

D．fewer