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  3. What could be simpler than shaking fruit from a tree? Well, the job is a lot tougher than you might think. There is definitely a

What could be simpler than shaking fruit from a tree? Well, the job is a lot tougher than you might think. There is definitely a

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问题     What could be simpler than shaking fruit from a tree? Well, the job is a lot tougher than you might think. There is definitely a right way and a wrong way to shake a fruit tree. And a person who is a good apple tree shaker may not be a good cherry tree shaker. Different fruits take different shakes.
    As a rule, a slow hard shake is best. This makes the fruit fall much faster than a light, quick jiggle. Most fruits have a set number of shakes per minute that will do the best job of getting them out of the tree and onto the ground. To shake down plums, try shaking the tree four hundred times per minute, moving the tree two inches at each shake. Experts say you’ll get three times more fruit from the tree than you will if you shake eleven hundred times per minute at one inch per shake. Cherries, because they are smaller, need more jarring. A good rate of shaking seems to be about twelve hundred shakes per minute. Apples, like plums, need four hundred shakes.
    Of course, some folks may choose to ignore all these expert directions for jiggling fruit. Keeping track of all the numbers can be enough to drive some people up a tree.  
The word "set" means ______.
选项 A、tiresome
B、great
C、fixed
D、collected
答案C
解析 第二段。根据上下文，不同的水果，其树的摇数也不同，是特定的。所以选项C是正确的。
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