如图，已知A点坐标为（5，0），直线$y=x+b\left(b>0\right)$与y轴交于点B，连接AB，若∠a=75°，则b的值为 (      )

李鸿樾是湖南浏阳县人，图是他的毕业证书。据所学知识判断，他毕业时正值

乌鱼    ____   a、章鱼

蜗牛    ____  b、螃蟹

蝴蝶    ____  c、蝙蝠

斑马    ____  d、海马

阅读理解

                                                                                      (B)

    Long long ago, there was no paper in the world. People had to write characters(汉字) in bamboo slips or stones.Then there was a man named Cai Lun who was a Chinese man. He made people use all kinds of things to invent paper. From then on, people can use paper to write on. Paper is a great invention. We always remember the great inventor Cai Lun. Nowadays paper is very useful in our work, study and our life. It really means a lot to human beings.

根据短文内容，判断下列句子的正 (A)与误 (B)，并在答题卡的相应位置将其涂黑。