In our class, when the bell rang and the teacher closed his book, it was a for everyone to stand up. [ ]A. signal B. chance C. mark D. measure 题目和参考答案——青夏教育精英家教网—

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，选项中有两项为选项．

Ea sy Way s to Keep Your Brain Sharp

　　Everyone i s forgetful, but a s we age, we start to feel like our brain s are slowing down a bit-and that can be a very annoying thing．　　1　　 Read on for some technique s worth trying．

　　1．　　2　　

　　People who regularly made plan s and looked forward to upcoming event s had a 50 percent reduced chance of Alzheimer' s di sea se(老年性痴呆症)， according to a recent study．　　3　　 Something a s simple a s setting a goal to have a weekly coffee date with a friend will do．There' s evidence that people who have a purpo se in life or who are working on long or short-term goal s appear to do better．In other word s, keep your brain looking forward．

　　2．Go for a walk．

　　Mildly rai sed glucose(葡萄糖)level s can harm the area of the brain that help s you form memorie s and phy sical activity can help get blood glucose down to normal level s．In fact, exerci se produce s chemical s that are good for your brain．　　4　　

　　3．Learn something new．

　　Take a Spani sh cla s s online, join a drawing club, or learn to play card s．A study found that mental stimulation limit s the weakening effect s of aging on memory and the mind．But the be st thing for your brain i s when you learn something new and are phy sically active at the same time．　　5　　 Or you can ju st go dancing with your friend s．

A．Focu s on the future．

B．Thi s can be e specially harmful to the aged．

C．It should be something like learning gardening．

D．So take a few minute s each day to do some reading．

E．But don't worry if our schedule i sn't filled with life－changing event s．

F．Luckily, re search show s there i s a lot you can do to avoid tho se moment s．

G．In other word s, when you take care of your body, you take care of your brain．

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