Unit 1 Section Ⅰ　Starting out & Understanding ideas（课时作业）-【优化探究】2021-2022学年新教材高中英语选择性必修第四册同步导学案（外研版）

Ⅰ.单句语法填空 1．In the face of such a serious problem, the government should take action to solve it. 2．On meeting(meet) his friends，he couldn't wait to show off his new shoes. 3．His latest book The Social Animal, however, is more ambitious (ambition) and serious than his earlier books. 4．Nelson Mandela devoted all his life to realizing(realize) the dream that people with different colors should be equal. 5．It turned out that his ambition of becoming a doctor came true at last. 6．He returned to the airport，only to find his car alarm going (go) off. 7．Film has a much shorter history，especially when it is compared (compare) to such art forms as music and painting. 8．Whatever I buy online, I pay more attention to the quality rather than the price. 9．The job market has changed and our approaches to finding (find) work must change as well. 10．You'd better put things back in place.Otherwise，it will be difficult to find them. Ⅱ.阅读理解 A Historians and archaeologists have defined periods of human history for centuries by the technologies or materials that made the greatest impact on society.This includes the Stone Age，the Bronze Age，and the Iron Age.But what age are we in now? That question can be answered with one word for some researchers：Plastics. “Plastic has redefined our material culture and the artifacts we leave behind.It will be found in stratified (分层的) layers in our trash deposits (沉积层)．” That's according to John Marston，an archaeologist. The wide variety of synthetic polymers (合成聚合物) would not exist if it weren't for human action.About six billion tons of plastics have been made and spread around the planet.They have been spread from forests to oceans ever since the first plastic polymers were invented. Plastics are one of the most significant changes that humans have made to the Earth's makeup.Most plastics don't easily degrade.This only adds to the problem.Recycling isn't an adequate solution.Not all types of plastic are easily recyclable.And there are only a few r