C．The US was an important exporting country in the middle of the last century.

　　D．The US economy now is not as prosperous as 30 years ago.

　　第二节（共5小题；每小题2分，满分10分）

　　根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多于选项。

　　Can't find your car keys? Forget what's on your grocery list? Can't remember the name of the personal trainer you liked at the gym? You're not alone. Everyone forgets things occasionally.

　　16

　　Although there are no guarantees when it comes to preventing memory loss, memory tricks can be helpful. Consider the following simple ways to sharpen your memory.

　　__17___

　　Just as physical activity helps keep your body in shape, mentally stimulating activities help keep your brain in shape — and memory loss at bay. Do crossword puzzles. Read a section of the newspaper that you normally skip. Learn to play a musical instrument. Volunteer at a local school or community organization. Get organized

　　You're more likely to forget things if your home is in a mess. Write down tasks, appointments and other events in a special notebook or calendar. You might even repeat each entry out loud as you write it down to help cement(巩固) it in your memory. Keep to-do lists current, and check off items you've completed.___18____

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