学生的质的规定性是（）

A、以学习为主

B、具有独立人格

C、学生是未成年人

D、具有儿童天性

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.

What is the author’s opinion ______.

A．Americans don’t have enough water.

B．Americans don’t use enough water.

C．Americans like to use water.

D．Americans use too much water.