题目内容
Many countries face a somewhat more serious economic problems in the form of an unfavorable trade balance (贸易逆差) with other nations. Such an imbalance exists when the total value of a country’s imports exceeds that of its exports. For example, if a country buys $250 billion of products from other countries, yet sells only $100 billion of its own products overseas, its trade deficit is $150 billion. Many underdeveloped nations find themselves in this position because they lack natural resources or the industrial capacity to use these resources, and thus have to import raw materials or manufactured goods.One effect of a trade deficit is the flow of currency (货币) out of a country. In the case of an underdeveloped nation, this can cause many financial difficulties, including failure to meet debt payments and obstacles to creation of an industrial base. Even in the case of a fully developed nation such as the United States, a large trade deficit is reason for alarm. American products, made by well-paid workers in US industries, cost more to produce than those made in places lille Asia, where labor and material costs are much lower. Money spent on foreign products is money not spent on items produced by domestic industries. According to the passage, when does a trade imbalance occur When（）.
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再投资风险是由于市场利率上升而造成的无法通过再投资而实现预期收益的风险。 ( )
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"I would tell anyone who’s thinking about going back to school that it’s not as difficult as you think," says Karen Jonaitis, a woman, last year, at 47, earned a bachelor’s degree in business administration at a college. "I realized that I would not move up in my career without a degree. "A generation ago, Jonaitis would have been a rarity(稀罕)in college. Today about 6 million people aged 25 or older are studying in American institutions of higher learning. Whether they are returning to improve job skills or for the love of learning, adults no longer see age as a deterrent(障碍). Most people jump at the opportunity to do something new. Some of them make changes they’d been thinking about all their lives. Others return to school out of economic necessity.New developments in neuroscience(神经科学)and psychology are confirming that there are few age limits on how much the brain can absorb and for how long--if you stay active. Continuing to learn keeps us mentally in shape and able to learn more. On mental tests, experts discovered, half to two-thirds of the people in their 70s were as intellectually quick as people in their 30s. Those who fell below average tended to be people who had not made a lifelong habit of reading. They also were less physically active.Many adult students say learning is easier for them today. They bring different skills to the classroom, and they’re less upset if something goes wrong. They have a real thirst, a real desire to learn. Learning is easier for adult students because（）.
鼻骨侧位摄影时与胶片或IP板、平板探测器垂直的是
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