题目

阅读短文内容，从方框中选出五个句子填入文中空缺处，使短文内容完整正确。The Silk Road is the name of different roads that long ago connected Europe, Africa and Asia. 【1】. Scientists believe people began to travel. The Silk Road about 3000 years ago. By the time the Chinese silk trade became important in the world. The Silk Road covered almost 6500 kilometers. It went from Rome to China, which is from the West to the Far East.More Chinese travelled along The Silk Road to carry silk, of course. They also carried and traded other things like spices (香料), c太阳光经过三棱镜后分解为红橙黄绿蓝靛紫七色光，这种现象叫做　        　；适当的　    　线照射可促进人体骨骼生长．