问题
填空题
甲，乙，丙三人进行百米赛跑（假定各人的速度保持不变），当甲到达终点时，乙离终点还有1m，丙还有2m，则当乙到达终点时，丙离终点还有______m．（保留3位有效数字）
答案
解；当乙跑了1m时，设丙跑了xm，
根据题意列方程得：
1：x=v乙：v丙=99：98，
解得：x=
，98 99
此时，丙离终点距离为2-98：99≈1.01（m）．
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甲，乙，丙三人进行百米赛跑（假定各人的速度保持不变），当甲到达终点时，乙离终点还有1m，丙还有2m，则当乙到达终点时，丙离终点还有______m．（保留3位有效数字）
解；当乙跑了1m时，设丙跑了xm，
根据题意列方程得：
1：x=v乙：v丙=99：98，
解得：x=
，98 99
此时，丙离终点距离为2-98：99≈1.01（m）．
| 完形填空。阅读下面短文，从短文后所给的四个选项中，选出可以填入空白处的最佳选项。 | ||||||||||||||
| Two friends were walking 1 the desert. During the journey they 2 . And the taller boy slapped the shorter 3 in the face. The shorter boy was hurt. But 4 , he wrote in the sand, "Today my best friend slapped me 5 the face." They 6 till they found a pond. And they decided to take a bath there. The shorter boy 7 in the mud and started to sink. He 8 , "Help! Help!" Luckily, he was pulled to 9 by his friend. After that, he carved on a stone, "Today my best friend 10 ." The taller boy asked him, "After I hurt you, you 11 in the sand, but now you carve on the stone. Why?" The shorter boy replied, "When someone 12 you, you should write it in the sand 13 the wind can erase (清除) it easily. However, when someone 14 for you, you should carve it on a stone from which the wind can 15 erase it." | ||||||||||||||
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