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蜂鸟是世界上最小的鸟，一只蜂鸟的体重约2克，一只麻雀的体重大约是蜂鸟的51倍，一

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蜂鸟是世界上最小的鸟，一只蜂鸟的体重约2克，一只麻雀的体重大约是蜂鸟的51倍，一只麻雀重多少克？

答案：

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（1）④（2）⑤ 200米（3）A（4）⑥此处有河流分布，且等高线密集，坡度陡，说明河流的落差大，水流急，漂流时速度快，惊险刺激。本题考查地图综合分析。（1）根据等高线的分布判断③与尼湖之间为一山脊；可能...

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     Traditionally, the President is the highest-pad public employee. A salary of $ 400,000, along with other
benefits, is paid to the President annually. But President Obama's income for 2008 was far more than that,
according to the White House.
     The White House recently published the tax returns (纳税申报单) of  Obama an  d Vice -president
Joe Biden. Tax returns are reports of tax that a person has to pay. They often include income information
used to calculate the tax. In the US, people whose incomes are over a certain amount have to file tax
returns(纳税申报)every year. The tax returns of government officials are open to the public. This
transparency helps to prevent corruption (腐败).
     From Obama's tax returns , we can see that the President and first lady President's two books
Dreams From My Father and The Audacity of Hope (无畏的梦想). The two books, published in
1995 and 2006,are very popular and have been on the bestseller (畅销书) list for a long time.
     The Obama's income is down from 2007,when they made ＄4.2 million. However, that is still far more
than former US President George Bush earned, who reported a total of ＄719,274 for his final year. The
Obamas' income also greatly exceeded(超出)that of Biden, who reported a family income of ＄2269,256.
That's about a tenth of what the Obamas earned. As Vice-president, Biden earns a salary of ＄220,000.
US families earn an average income of about ＄50,000.
     The Obama's tax returns also show that together, the President and his wife paid about ＄933,000 in
taxes. They gave $172,050 -nearly 6.5 percent of their earnings -to different charity groups. In the US, if
a person gives his money to churches and non-profit (非盈利) organizations, the law reduces his or her
taxes. This is one reason why rich people in the US like to give money to charity.
1. _______had the highest income in 2008.
A. Obama          
B. Biden          
C. Bush        
D. George
2. How much did Obama and his wife earn in 2008?
A. $400,000        
B. $2,660,000      
C. $4,200,000    
D. $719,274
3. In the US, which people have to file tax returns?
A. Everybody                      
B. Wealthy people    
C. Government officials    
D. People whose incomes are over a certain amount.
4. The Obamas have given_______ percent of their earnings to charity.
A. 10              
B. 6.5              
C. 9.7         
D. 4.3
5.Why should the tax returns of government officials be open to the public?.
A. Because it can help to prevent corruption
B. Because it can make government officials well-known to the public.
C. Because it can help government officials to get more money.
D. Because the government wants them to pay more taxes to the public.
6. According to the law, if a rich man gives his money to charity,_______.
A. he will be praised by the people      
B. he will pay fewer taxes        
C. he will be free of taxes        
D. he will get some extra money from the government.
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