谈到买东西,就要从我第一次说起了。当我坐在沙发上优闲的看着书时,妈妈突然叫我帮她买鸡蛋,可是这是我第一次跑腿耶,让我心里七上八下,坐立难安,生怕遇到坏人。
由于现在是下班时间,路上车水马龙,汽摩托车互不相让,让我胆战心惊,深怕一不小心就被撞个头破血流。我费尽了千辛万苦终于来到了杂货店。我挑选了看起来不错的蛋,在回家的路上非常的谨慎,不让蛋受到丝毫的伤害,但究竟还是破了两个,妈妈说没关系,下次再注意一点就好了。这句话让我重拾信心,所以,几天后我自告奋勇去帮妈妈买早餐,结果就获得了很好的赞赏。自从这次之后,我就变成了妈妈的“小帮手”。
但是,有一次,我竟然在路上遇到了一只狗,吓得我拔腿就跑,完全已经把买好的蛋忘得一干二净。结果回到家时,蛋已经不知去向了。还有一次,我还遇到了一个可疑的陌生人,我在我靠着机智和灵敏,终于把他给甩掉了。这场惊魂记深深的印在我心里。
我觉得帮妈妈买东西,不但可以减轻她的负担,还可以运动,真是一举两得。
the sun rises in the east and sets in the west, which is caused by the rotation of the earth as you all know. but have you ever thought of the effect of the earths rotation on man and can you imagine what would happen if the earth stopped rotating?
the radius of the earth is about 6,370 kilometres. it takes the earth 24 hours to rotate once. objects on the earths equator move with the earth at a speed of 460 metres per second, and the air close to the earths surface turns at the same speed. if the earth stopped rotating suddenly, the air would keep flowing eastward at a speed of 460 metres per second. the wind would be fourteen times as powerful as a hurricane. at the same time sea water would rush eastward at a speed of several hundred metres per second, which might do damages much greater than a seaquake would do. obviously, men could hardly stand such a catastrophe.
even if such a catastrophe would not happen, there would be a great temperature difference on the two hemispheres of the earth, and the four seasons of the year would no longer occur because a day and a night would be as long as a whole year instead of 24 hours. all this would greatly affect the life of human beings, imals and plants and that would cause worse results than anything imaginable.
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