问题
填空题
已知某一铁桥长1000m,有一列火车从桥上通过,测得火车开始上桥到完全过桥共有1min,整列火车在桥上的时间为40s,则火车的速度和车长分别为______米/秒和______米.
答案
设火车的速度为xm/s,车长为ym,则:
60x=1000+y 40x=1000-y
解得x=20 y=200
所以火车的速度和车长分别为20米/秒和200米.
故填20,200.
已知某一铁桥长1000m,有一列火车从桥上通过,测得火车开始上桥到完全过桥共有1min,整列火车在桥上的时间为40s,则火车的速度和车长分别为______米/秒和______米.
设火车的速度为xm/s,车长为ym,则:
60x=1000+y 40x=1000-y
解得x=20 y=200
所以火车的速度和车长分别为20米/秒和200米.
故填20,200.
阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项。 Cherish (珍惜) now no longer missed John, a famous musician, took his priceless antique zither (齐特琴) and played it in the crowded subway station. The music coming from the zither was delicately(优美地)streaming throughout the whole . However, during the one-hour play, only six or seven people were truly the charming music. John only got 52 dollars for his work that day. However, in normal days, when John is about to hold a , one ticket can be sold at more than 100 dollars and it is extremely to buy a ticket even at such a high price. Therefore, later, many passers-by in the station that day felt deeply for not recognizing the famous musician and missing such valuable but music feast. I have a very friend who had totally changed after that his wife came down with an acute (严重的) illness. He cooked by himself for the family and took a walk with his wife every day. Nonetheless(但是), his wife still did not to conquer the illness and passed away after three months. After that, he often sighed miserably that due to his past busy life, he had a lot of beautiful time with his wife. But now, it is to make up for it. It is no use crying over spilt milk. We have a lot of precious things in our life without knowing how to them. Actually, I also missed something before. The reason is simple: we had thought that we could still own them tomorrow. Nevertheless, tomorrow is actually reliable. There was a famous Buddhist monk (修道士) saying that in many people’s lives, they have only done two things: waiting and . The result is that they were always too late to cherish they had before they lost it. We would often claim to do something when we , or when we have money or when we become old, etc. However, when we reach the , we could no longer realize our , because we have lost it by then.
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