文档介绍：
The two graphs show the main sources of energy in the USA in the 1980s and the 1990s.
思路：
1. 采用折线模式描述
2. 注意重点数据的选取(max, min)
3. 注意分段原则：一段写上升，一段写下降，一段写保持不变。
答案：
The two graphs show that oil was the major energy source in the USA in both
1980 and 1990 and that coal, natural gas and hydroelectric power remained in
much the same proportions. On the other hand, there was a dramatic rise in
nuclear power, which doubled its percentage over the ten years.
Oil supplied the largest percentage of energy, although the percentage
decreased from 42% in 1980 to 33% in 1990. Coal in 1990 was the second largest
source of energy, increasing its proportion to 27% from 22% in the previous
decade. Natural gas, the second largest source in 1980 at 26%, decreased its
share very slightly to provide 25% of America’s energy ten years later.
There was no change in the percentage supplied by hydroelectric power which
remained at 5% of the total energy used. Nuclear power the greatest change:
in 1990 it was 10%, twice that of the 1980s.
In conclusion, during the decade, the structure of energy resources remained,
and the proportion of 3 aspects varied a lot, except natural gas and
hydroelectric power.（180）
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