2018 年 06 月大学英语六级考试真题（第 3 套）

When Elon Musk says that his new priority is using artificial intelligence to build domestic robots, we should look forward to the day in admiration.

Mr. Musk is a guy who gets things done. The founder of two tech companies, Tesla Motors and SpaceX, is bringing electric vehicles to mass market and __26__ humans to live on other planets. This sounds like so much hot air, but the near $13 billion fortune this entrepreneur has __27__ comes from practical achievements rather than hypothetical ones.

A lot of clever people are __28__ about artificial intelligence, fearing that robots will one day become so __29__ that they'll murder all of us. These fears are mostly __30__: as with hysteria about genetic modification, we humans are generally wise enough to manage these problems with speed and care.

And just think of how wonderful it would be if you had a live-in robot. It could, __31__, be like having a babysitter and a nurse rolled into one--or, if that required __32__ intelligence beyond the power of Mr. Musk's imagined machine, at least someone to chop the carrots, wash the car and mow the lawn. Once purchased and trained, this would allow the __33__ user to save money and time, freeing up __34__ space in our busy lives to read a good book.

That is why we welcome Mr. Musk's latest __35__, and wish him well. As long as robots add to the sum of human happiness, reduce suffering, and create time to read world-class journalism, we should be their fans. Especially since journalism is one job robots will never do.

Economically speaking, are we better off than we were ten years ago? Twenty years ago? In their thirst for evidence on this issue, commentators seized on the recent report by the Census Bureau, which found that average household income rose by 5.2% in 2015.

Unfortunately, that conclusion puts too much weight on a useful, but flawed and incomplete, statistic. Among the more significant problems with the Census's measure are that: 1) it excludes taxes, transfers, and compensation like employer-provided health insurance; and 2) it is based on surveys rather than data. Even if precisely measured, income data exclude important determinants of economic well-being, such as the hours of work needed to earn that income.

While thinking about the question, we came across a recently published article by Charles Jones and Peter Klenow, which proposes an interesting new measure of economic welfare. While by no means perfect, it is considerably more comprehensive than average income, taking into account not only growth in consumption per person but also changes in working time, life expectancy, and inequality. Moreover, it can be used to assess economic performance both across countries and over time.

The Jones-Klenow method can be illustrated by a cross-country example. Suppose we want to compare the economic welfare of citizens of the U.S. and France in 2005.

In 2005, as the authors observe, real consumption per person in France was only 60% as high as in the U.S., making it appear that Americans were economically much better off than the French on average. However, that comparison omits other relevant factors: leisure time, life expectancy, and economic inequality. The French take longer vacations and retire earlier, so typically work fewer hours; they enjoy a higher life expectancy, presumably reflecting advantages with respect to health care, diet, lifestyle, and the like; and income and consumption are somewhat more equally distributed there than in the U.S. Because of these differences, comparing France's consumption with the U.S.'s overstates the gap in economic welfare.

Similar calculations can be used to compare the U.S. and other countries. For example, this calculation puts economic welfare in the United Kingdom at 97% of U.S. levels, but estimates Mexican well-being at 22%.

The Jones-Klenow measure can also assess an economy's performance over time. According to this measure, as of the early-to-mid-2000s, the U.S. had the highest economic welfare of any large country. Since 2007, economic welfare in the U.S. has continued to improve. However, the pace of improvement has slowed markedly.

Methodologically, the lesson from the Jones-Klenow research is that economic welfare is multi-dimensional. Their approach is flexible enough that in principle other important quality-of-life changes could be incorporated—for example, decreases in total emissions of pollutants and declines in crime rates.

If you've ever started a sentence with, "If I were you..." or found yourself scratching your head at a colleague's agony over a decision when the answer is crystal-clear, there's a scientific reason behind it. Our own decision-making abilities can become depleted over the course of the day causing indecision or poor choices, but choosing on behalf of someone else is an enjoyable task that doesn't suffer the same pitfalls.

The problem is "decision fatigue," a psychological phenomenon that takes a toll on the quality of your choices after a long day of decision making, says Evan Polman, a leading psychologist.

Physicians who have been on the job for several hours, for example, are more likely to prescribe antibiotics to patients when it's unwise to do so. "Presumably it's because it's simple and easy to write a prescription and consider a patient case closed rather than investigate further," Polman says.

But decision fatigue goes away when you are making the decision for someone else. When people imagine themselves as advisers and imagine their own choices as belonging to someone else, they feel less tired and rely less on decision shortcuts to make those choices. "By taking upon the role of adviser rather than decision maker, one does not suffer the consequences of decision fatigue," he says. "It is as if there is something fun and liberating about making someone else's choice."

Getting input from others not only offers a fresh perspective and thought process, it often also includes riskier choices. While this sounds undesirable, it can be quite good, says Polman. "when people experience decision fatigue-when they are tired of making choices-they have a tendency to choose to go with status quo," he says. "But the status quo can be problematic. Since a change in the course of action can sometimes be important and lead to a positive outcome."

In order to achieve a successful outcome or reward, some level of risk is almost always essential. "People who are susceptible to decision fatigue will likely choose to do nothing over something," he says. "That's not to say that risk is always good, but it is related to taking action, whereas decision fatigue assuredly leads to inaction and the possible chagrin of a decision maker who might otherwise prefer a new course but is unfortunately hindered."

Just because you can make good choices for others doesn't mean you'll do the same for yourself, polman cautions. "Research has found that women negotiate higher salaries for others than they do for themselves," he says, adding that people slip in and out of decision roles.