[填空题]

Anyone paying attention to the debate over Social Security has heard a litany of dates. There’s 2018, when the program is expected to start taking in less in taxes than it pays out in benefits. And there’s 2042 (or 2052 by some estimates), when its trust fund is supposed to run out of money.
(41)___________________
For years, the government has collected more in Social Security taxes than it needed to pay current benefits, Those excess collections are credited to the Social Security Trust Fund, ostensibly to pay future retirees. But there is no actual money in the fund. Instead, the government spends the money for other purposes and issues the fund IOUs.
In 2009, the shell game begins to end. The amount by which Social Security taxes exceed benefits starts to shrink. (42)___________________
The problem could have been avoided, and it still could be reduced.
If the rest of the budget was in good shape--and particularly if the gov

[简答题]

Anyone paying attention to the debate over Social Security has heard a litany of dates. There’s 2018, when the program is expected to start taking in less in taxes than it pays out in benefits. And there’s 2042 (or 2052 by some estimates), when its trust fund is supposed to run out of money.
(41)___________________
For years, the government has collected more in Social Security taxes than it needed to pay current benefits, Those excess collections are credited to the Social Security Trust Fund, ostensibly to pay future retirees. But there is no actual money in the fund. Instead, the government spends the money for other purposes and issues the fund IOUs.
In 2009, the shell game begins to end. The amount by which Social Security taxes exceed benefits starts to shrink. (42)___________________
The problem could have been avoided, and it still could be reduced.
If the rest of the budget was in good shape--and particularly if the gov

[简答题] The Debate over Genetically Modified Foods --Rice with built-in Vitamin A that can help prevent blindness in 100 million children suffering from Vitamin A deficiency --A tomato (hat softens more slowly, allowing it to develop longer on the vine and keep longer on the shelf --Potatoes that absorb less fat when fried, changing the ever-popular French fries from junk food into a more nutritional food --Strawberry crops that can survive frost These are some of the benefits promised by biotechnology. The debate over its benefits and safety, however, continues. Do we really need to fear mutant (突变体) weeds, killer tomatoes, and giant corn and will the benefits be delivered Conventional Breeding Versus Genetically Modified (GM) Crops For thousands of years farmers have used a process of selection and cross breeding to continually improve the quality of crops. Even in nature, plants and animals selectively breed, thus ensuring the optimum