24. What does the underlined part “make a killing” in Paragraph 7 mean?

　　A. Beat all other businesses.

　　B. Make a lot of money in a short time.

　　C. Force other batteries to withdraw from market.

　　D. Be the business leader in battery making.

　　C

　　The slow death of the American dream for middle class families has continued in the last couple of years in the wake of the financial crisis.

　　A study shows a shocking decline in the average net worth of U.S. households from 2007 to 2010. The average American family saw their net worth drop 40% in that three years, from $126,400 to $77,300.

　　The loss, not surprisingly, is due in large part to falling home prices. The average homeowner saw their net worth fall more than $70,000 from roughly $250,000 in 2007 to $175,000 in 2010.

　　In three years, 18 years of savings have been wiped away for the majority of the country and at the same time wages have fallen. The average income fell from about $50,000 in 2007 to $46,000 in 2010.

　　But this negative trend does not stop there. As average families become poorer, rich Americans are growing richer. The Fed survey showed the wealthiest 10% of families actually saw their net worth rise from 2007 to 2010. Over that time period, their net worth increased from $1.17 million to $1.19 million.

　　The continued decline of the American middle class has resulted in income inequality at levels not seen since the Great Depression. Many economists agree.

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