我国领土面积居世界第三位，但耕地面积还不如印度，其主要原因是（ ）
A．我国山区面积大，平原面积只占12%
B．印度国土面积大
C．印度位于热带地区
D．我国不以种植业为主
如果把山地、丘陵连同比较崎岖的高原合称为山区，那么我国山区面积约占全国总面积的2/3，平原面积只占12%．我国的耕地面积居世界第4位，仅次于美国、俄罗斯和印度，我国耕地面积约1.3亿公顷，却承受着养活世界21%的人口的沉重负担．我国现有的宜垦荒地资源数量不多，其中可开垦为耕地的荒地就更少了．
故选：A．
Have you ever been in a meeting while, someone was making a speech and realized suddenly that your mind was a million miles away? You probably felt sorry and made up your mind to pay attention and ever have been told that daydreaming is a waste of time. “On the contrary,” says L. Giambra, an expert in psychology, “daydreaming is quite necessary. Without it, the mind couldn't get done all the thinking it has to do during a normal day: You can't possibly do all your thinking with a conscious mind. Instead, your unconscious mind is working out problems all the time. Daydreaming then may be one way that the conscious and unconscious states of mind have silent dialogues.” Early experts in psychology paid no attention to the importance of daydreams or even considered them harmful. At one time daydreaming was thought to be a cause of some mental illnesses. They did not have a better understanding of daydreams until the late 1980s. Eric Klinger, a professor of psychology, is the writer of the book Daydreaming. Klinger says, “We know now that daydreaming is one of the main ways that we organize our lives, learn from our experiences, and plan for our futures: Daydreams really are a window on the things we fear and the things we long for in life.” Daydreams are usually very simple and direct, quite unlike sleep dreams, which may be hard to understand. It's easier to gain a deep understanding of your life by paying close attention to your day dreams than by trying to examine your sleep dreams carefully. Day dreams help you recognize the difficult situations in your life and find out a possible way of dealing with them. Daydreams cannot be predicted, they move off in unexpected direction which may be creative and full of ideas. For many famous artists and scientists, daydreams were and are a main source of creative energy. About Daydreams
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