材料一：绿洲是指沙漠中具有水草的绿地。它多呈带状或块状分布在河流或井、泉附近，以及有冰雪融水灌溉的山麓地带，绿洲地区也是当地人口的主要聚居区。

材料二：近几年来，于田县大力发展红枣种植业，特别是优良品种骏枣的种植面积大规模增加，成为于田县富民强县的支柱产业之一，涌现出了新疆昆仑山枣业股份有限公司、于田中天圣果果品有限公司等大型红枣种植和加工企业。

世界经济全球化趋势出现的主要原因是(     )

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    Once there was a father and a son. They were ill-tempered(坏脾气的) and never gave way to  1 .One day the father 2 to ask some friends to dinner in his house. He 3 his son to buy some meat in town. When the son walked towards the town gate, a man was coming from the outside. The gate wasn't 4 enough to let two men in and out at the same time. But neither of 5 would give way to the other. They stood straight face to face inside the gate hour after hour. But the father was worried. “What shall I do? My son hasn't 6  yet. I can't wait any more.” He wanted to know what was the 7 with his son. So he left his friends at home, and went to town 8 his son. “You may first take the 9 home for my friends .Let me 10 here instead.” he said to his son when he knew what had happened.

一个人站立于平面镜前3m处，如果此人以0.5m/s的速度向镜面走去，经过1秒钟人与像的距离是（  ）