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
科目：高中英語 來源：河北省邢臺一中2011－2012學年高二下學期第四次月考英語試題 題型：053
根據短文內容，從短文后的選項中選出能填入空白處的最佳選項，選項中有兩項為選項．
Ea sy Way s to Keep Your Brain SharpEveryone 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(老年性癡呆癥)， 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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