阅读下面课内文言文,回答1~3题。
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,故患有所不辟也。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,则凡可以辟患者何不为也?由是则生而有不用也;由是则可以辟患而有不为也。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。
(I)以O为位似中心,在第一象限内将菱形OABC放大为原来的2倍得到菱形OA1B1C1,请画出菱形OA1B1C1,并直接写出点B1的坐标;
(II)将菱形OABC绕原点O顺时针旋转90°菱形OA2B2C2,请画出菱形OA2B2C2,并求出点B旋转到点B2的路径长.
Gypsies
According to the linguistic and genetic researches, ancestors of the Gypsies left the land of India in the amount that did not go beyond 1,000 people. Today there are about 10 million Gypsies in the world. Some scientists believe that Gypsies were Egyptians.
Sumerians
Sumerians must be the mysterious people in the ancient world. We know nothing about their origin and nothing about the origin of their language. The Sumerians were rather advanced—they became the first in the Near East to use a wheel, to create an irrigation system and their unique writing. And besides, they were impressively good at maths and astronomy.
Maya
Some scientists believe that they are connected to legendary atlantes (男像柱), others suppose their ancestors were Egyptians. It's thought that the Maya created an efficient agricultural system and had deep astronomy knowledge. Their calendar was used by other people of Central America. Maya applied the hieroglyphic writing (象形文字) system. Now it seems that the Maya came from nowhere and disappeared nowhere.