Thousands of years ago，human(人类)didn’t live in towns．Sometimes they would live in caves(洞穴)or build camps in the forest．
Only about thirty people1 in each camp．The men would go hunting while the woman and children2food from trees around the camp．All the food was 3 among people in the group．Every few weeks they moved to another place to find more food．It was a simple life，but people had to be 4 .They had to make everything that they needed，and they had to know a lot about plants and animals．
Nowadays most people live in towns and cities，and they work in offices and factories．Life is 5than in the old days．There are fewer 6，but there is less excitement．Some people go7  excitement  sailing round the world．climbing mountains，or exploring(探测)caves．
Most people look forward to the8,a time when they can enjoy a change from the normal life．For some this means going camping．But camping today is 9 from camping in the past．Gas cookers，ready-made food and air-beds mean people can camp much more10 than they did in the old times．

唐代张彦远在其美术通史著作《历代名画记》中，将品评绘画的标准分为五等，即“自然”、“神”、“妙”、“精”、“谨细”，认为“自然者，为上品之上”、“失于自然而后神，失于神而后妙，失于妙而后精，精之为病也，而成谨细”。这反映出张彦远的绘画理论（    ）

“中共八大”、“国民经济的调整”、“文化大革命”共同反映出的时代主题是（   ）