采取人的中腔上皮细胞时，需要用的工具是：

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鱼我所欲也
      鱼，我所欲也，熊掌，亦我所欲也，二者不可得兼，舍鱼而取熊掌者也。生，亦我所欲也，义，亦我所欲也，二者不可得兼，舍生而取义者也。生亦我所欲，所欲有甚于生者，故不为苟得也。死亦我所恶，所恶有甚于死者，故患有所不避也。如使人之所欲莫甚于生，则凡可以得生者何不用也。使人之所恶莫甚于死者，则凡可以避患者何不为也！由是则生而有不用也；由是则可以避患而有不为也。是故所欲有甚于生者，所恶有甚于死者。非独贤者有是心也，人皆有之，贤者能勿丧耳。
      一箪食，一豆羹，得之则生，弗得则死。呼尔而与之，行道之人弗受；蹴尔而与之，乞人不屑也。
     万钟则不辨礼义而受之，万钟于我何加焉！为宫室之美，妻妾之奉，所识穷乏者得我欤？向为身死而不受，今为宫室之美为之；向为身死而不受，今为妻妾之奉为之；向为身死而不受，今为所识穷乏者得我而为之：是亦不可以已乎？此之谓失其本心。

    A boy and a girl were playing together. The boy had a lot of small glass 1. The girl had some candies with her. The boy told the girl that he would2her all his balls in exchange for (交换) her candies. The girl thought that was a good3.

    But the boy didn't give4of his balls to the girl. He kept the biggest and the5ball in his pocket and gave the others to the girl. 6the girl gave him all her candies.

    That night, the girl had a 7sleep, but the boy didn't sleep well. He kept thinking whether the girl had 8some candies from him.

    You think in the way you do things. If you don' t give your hundred percent(百分之百) in a relationship, you'll 9 keep thinking if the other person has given his or her hundred percent. This is true for any relationship.

    Give your hundred percent to everything you do and you'll find that you can always10a lot of happiness.

地球内部厚度最大的圈层是（　　）