为了某种需要，现要绘制一幅代表某个国家7个省——G、I、J、L、P、S、V——的地图。G与除J之外的所有其他5个省相邻； I恰好与4个省——G、J、P、V相邻；J恰好与2个省——I和P相邻； L恰好与2个省——G和V相邻； P恰好与3个省——G、I、J相邻; S仅与G相邻； V恰好与三个省——G、I、L相邻。恰好要用6种颜色——金色、翡翠色、橄榄色、红色、银色、白色来表示这7个省，每种颜色至少使用一次，每个省在地图上仅用一种颜色，地图颜色的运用遵从以下条件：(1)相邻的省不能使用相同的颜色；(2)翡翠色和橄榄色不能相邻；(3)银色和白色不能相邻；(4)G的颜色是红色；(5)I用翡翠色。
下面哪一个省在地图上既不能是红色又不能是翡翠色
A．I
B．J
C．L
D．P
参考答案：D
解析：G与P相邻，I也与P相邻，因此P不能与G、I同色，即P不能是红色，也不能是翡翠色，所以选D
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| A little boy was spending his Saturday morning playing in his sandbox (儿童玩耍的沙场). He had with him his box of cars and trucks and a shiny, red plastic shovel (铲子). In the process of creating roads in the soft sand, he 1 a large rock in the middle of the sandbox. The boy dug_ around the rock, managing to 2 it from the sand. With a little bit of 3 , he pushed the rock 4 the sandbox by using his feet. When the boy got the rock to the 5 of the sandbox, 6 , he found that he couldn't 7 it up and over the little wall. 8 , the little boy pushed and dragged, but every time he 9 he had made some progress, the 10 tipped and then fell back 11 the sandbox. The little boy had tried his best, but his only 12 was to have the rock roll back, smashing his finger. Finally he burst into tears of disappointment. All the 13 the boy's father 14 from his living room window as the story continued. At the moment the tears fell, a large shadow fell across the boy and the sandbox. It was the boy's 15 . Gently but firmly he said, "Son, why didn't you use all the strength 16 that you had?" Defeated, the boy sobbed back, "But I did, Daddy, I did! I used all the strength that I had!" "No, son." 17 the father kindly. "You didn't use all the strength you had. You didn't 18 me." With that the father 19 down, picked up the rock and removed it from the sandbox. Do you have "rocks" in your life that need to be removed? Are you discovering that you don't have 20 it takes to lift them? There is one who is always available to us and willing to give us the strength we need. | ||||
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