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Imagine a product that can be used as medicine, a cleaning agent and a beauty treatment. You can eat it, drink its juice, and【C1】______essential oil from it. It is available all over the world, and is inexpensive. You may even have one in your kitchen【C2】______What is it? The lemon!
It is thought that lemons【C3】______in Southeast Asia. From【C4】______they were gradually carried westward toward the Mediterranean. Lemon trees thrive in mild【C5】______which is why they grow so well in places like Italy, Mexico, Spain, and even parts of Africa and Asia. A mature tree, depending on the variety and location, can produce【C6】______from 200 to 1, 500 lemons a year. The cultivated(培育的)varieties【C7】______in different periods, making it possible to harvest lemons all year round.
You don’t need lots of space to grow a lemon tree. Even a sunny balcony(阳台)is enough,【C8】______small lemon trees can be grown in pots and can make your house beautiful. They like sunny, wind-free spots where they can soak up the warmth,【C9】______against a wall. However, if the temperature drops a lot during the winter, they need to be【C10】______or brought indoors.
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There once was a master who came to India, perhaps from Persia. When he got there, he saw a lot of【C1】______. In India they have plenty of fruit to sell, but much of it is expensive. So he saw a big basket of some very red, long fruit, the cheapest in the shop. He bought a whole kilogram of the fruit and started【C2】______it. But after he ate some of it, his eyes and mouth【C3】______and burned, and his face became red. He coughed and choked, jumping up and down.
But he still continued to eat the fruit! Some people who were【C4】______him said, “ Those are hot peppers! People use them as a flavor, but only a little bit to put into food for【C5】______. You can’t just eat them【C6】______that; they’re not fruit!“ But the stupid master said, “No, I can’t stop! I【C7】______money for them, and now I’ll eat them. It’s my money!“
And you think that master was stupid, right?【C8】______, we sometimes do a lot of things like that. We invest money, time or effort in a relationship, business or job. Even though bitter experience tells us it won’t work, we still continue just【C9】______we’ve invested money, time, effort and love into it. Just like the man who ate the peppers and【C10】______so much but couldn’t stop because he didn’t want to waste the money he’d paid.
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Working memory, or short-term memory, involves the ability to hold and use information in the immediate future.【C1】______is only held in working memory for about 20 seconds. The challenge that students【C2】______is to move information from their working memories into their long-term memories. If they don’t do this in about the first few minutes after receiving the information, that information can be lost. To keep this newly learned material from【C3】______away, it needs to enter the network of the brain’s wiring.
After repeated practice, working memories are set down as permanent neuronal(神经的)circuits【C4】______to be activated(激活)when the information is needed. When a memory has been recalled【C5】______its neuronal circuits are more highly developed because of their repeated activation.
【C6】______exercising a muscle, these circuits then become more efficient and easier to access and activate. Practice results【C7】______repeated stimulation of the memory circuit. Like hikers along a path【C8】______eventually leave a depression in the road, repeated practice stimulates cells in the memory circuit such that the circuit is reinforced and becomes【C9】______This means it can be quickly turned from off to on, and switched【C10】______through a variety of cues coming in from the senses.
