话题如下：
The line graph shows the average annual expenditures on cell phone and residential phone services between 2001 and 2010.
该线图展示美国2001-2010年间年均花在手机和座机上的开支。请作答。
范文推荐：
The line graph compares average yearly spending by Americans on mobile and landline phone services from 2001 to 2010.
It is clear that spending on landline phones fell steadily over the 10-year period, while mobile phone expenditure rose quickly. The year 2006 marks the point at which expenditure on mobile services overtook that for residential phone services.
In 2001, US consumers spent an average of nearly $700 on residential phone services, compared to only around $200 on cell phone services. Over the following five years, average yearly spending on landlines dropped by nearly $200. By contrast, expenditure on mobiles rose by approximately $300.
In the year 2006, the average American paid out the same amount of money on both types of phone service, spending just over $500 on each. By 2010, expenditure on mobile phones had reached around $750, while the figure for spending on residential services had fallen to just over half this amount.
重难点词汇学习：
landline
释义
n.陆上运输; 陆空界线; 陆海界线;
I'll call you later on the landline.
晚些时候我会用固定线路给你打电话。
Nothing much! Do you want me to call you a landline?
还行吧,你想让我打你的固定电话吗 ?
Do you need both a landline and a mobile phone?
你需要同时使用座机和手提电话 吗 ?
expenditure
释义
n.花费，支出; 费用，经费; （尤指金钱的）支出额; （精力、时间、材料等的）耗费;
A change in the money supply brings a corresponding change in expenditure.
货币供应量的改变随即引起支出的相应改变。
The poor are taking advantage of this edict to marry off their daughters without enormous expenditure while they can.
穷人们利用这个法令，尽量不花费巨额开销就把女儿嫁出去。
People often put money aside in order to save up enough to make one major expenditure.
人们常常为了一笔大的开销而存钱。
residential
释义
adj.住宅的，适于作住宅的; 与居住有关的; 适宜作住宅的;
safer and more liveable residential areas
更安全和更适于居住的住宅区
a quiet residential area
安静的住宅区
A factory making armaments had been bombed the night before and a residential area not far away had been pulverized.
前天晚上，一家兵工厂被炸，不远处的居民区也被夷为平地。
