下面是“圆梦1+1”爱心助学公益活动标志。请写出该标志的构图要素，并说明图形寓意。要求语意简明，句子通顺，不超过100个字。

    Mr. White had to travel somewhere on business, and as he was in a hurry, he decided to go 1 He liked sitting2 a window when he was flying, so when he got onto the plane, he looked for a window seat. He3 all of them taken but one. There was a young man 4 beside it, and White was surprised that he had not taken the one 5 the window. Anyhow, he went towards it.When he 6 it, however, he saw that there was a notice on it, written 7 large letters,8“This seat is kept for proper balance. Thank you.” Mr. White had never seen such a notice before, but he thought the plane must 9 something especially heavy in its room10 makes it necessary to have the passengers properly11, So he walked on and found 12 empty seat, not beside the window  13 .

    Two or three other people 14  to sit near the window 15 the young man, but they also read the notice and went on. Then when the plane was nearly 16 , a very beautiful girl 17  into the plane. The young man, who was watching the passengers coming in, 18 took the notice 19the seat beside him, and20 succeeded in having a pretty companion during the whole trip.

“抗体”是一种什么物质              (    )

英国是第一个迈进现代社会的国家，在18世纪和19世纪的时候，它是世界发展的领头羊。自豪的英国人曾经以“日不落帝国”来形容自己的国家，因为在19世纪末的时候，它的殖民地遍及亚洲、非洲、美洲、大洋洲所有大陆板块，总面积达930万平方公里，统治着世界上三亿多的人口。
请回答：
（1）根据以上材料并结合所学知识，概括英国在“18世纪和19世纪的时候”，成为“世界发展的领头羊”的条件。
根据材料并结合所学，分析英国成为“世界领头羊”后对世界的发展产生了哪些影响？