科目: 來源:安徽省模擬題 題型:閱讀理解
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科目: 來源:安徽省模擬題 題型:閱讀理解
任務(wù)型讀寫。閱讀下面短文,根據(jù)所讀內(nèi)容在表格中的空白處填入恰當(dāng)?shù)膯卧~。 注意:每個空格只填一個單詞。 | ||||||||||
In a memory-based competition between you and a chimp (猩猩); who do you think would win? If you put yourself on top, you might want to guess again. In a test that challenged participants to remember numbers, a young chimp performed better than Japanese college students. Here's how the test worked. At Kyoto University in Japan, human students and chimpanzee participants sat in front of a computer. Five numbers, ranging from 1 to 9,were combined with one another and then, they appeared at random places on the screen. The numbers stayed on the screen for less than a second. In the first test, for example, participants saw the numbers for 650 milliseconds (about two-thirds of a second). Then, each number disappeared and they saw a white square instead. Participants had to touch the squares in numerical order, based on the numbers that had been there a moment before. In this test, the students touched the boxes in the correct order about 80 percent of the time. A young chimp named Ayumu performed equally well. During a harder test, participants were only able to see the numbers for 210 milliseconds. This time, students only succeeded in putting the boxes in the correct order about 40 percent of the time. But Ayumu still could select the boxes in the right order nearly 80 percent of the time. Some people have what's called a "photographic memory," which allows them to remember a surprising number of details after just a quick glimpse of something. Ayumu's memory might work in a similar way, says lead researcher Tetsuro Matsuzawa. The chimp's young age might have something to do with his impressive perfomance, too. In previous tests, the Japanese researchers found that young chimps perfomed better than their mothers. The scientists are interested to see whether Ayumu loses his strong memory as he gmws older. They already know that young children sometimes have sharp memories when offered something photographical, but they lose this ability over time. | ||||||||||
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科目: 來源:黑龍江省模擬題 題型:閱讀理解
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科目: 來源:黑龍江省模擬題 題型:閱讀理解
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科目: 來源:福建省模擬題 題型:閱讀理解
閱讀理解。 | ||
As bananas ripen, the green skin turns yellow gradually. Chemical changes occur in the flesh of the fruit as well: starch (淀粉) changes to sugar; pectin (果膠) breaks down, losing its stiffness; and the flesh softens. Is ripening fruit a self-contained system, or is the rate of these changes affected by the environment? We designed the experiment below to see if different atmospheres, produced by different packaging, affected the rate of ripening. You will vary the atmosphere surrounding unripe bananas and observe the effect on the ripening process.
oxygen and gives off CO2. Oxygen is extremely important and necessary for the chemical reactions involved in ripening. In addition, ripening fruit gives off another gas, called ethylene (乙烯). Not only is ethylene a product of ripening fruit, it also promotes the further ripening of the fruit. Paper bags tend to keep the ethylene in, but they allow oxygen and ethylene to pass through slowly. Plastic bags do not allow the free flow of oxygen or ethylene. In this experiment, the green banana in paper bag with the ripe banana should ripen most quickly. The green bananas in the paper bag should ripen faster than the bananas in the plastic bag. The banana left exposed to air has an unlimited supply of oxygen, so it will turn brown most quickly. You will notice that the side of this banana that rests on the counter will ripen more quickly than the other sides, because it has the closest contact (接觸) with its own ethylene. The banana that is tightly wrapped in plastic has no oxygen supply and should ripen most slowly. Now can you see why bananas are sealed in plastic in many supermarkets? | ||
1. What makes the green banana in Bag 2 ripen more quickly than the ones in Bag 1? | ||
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A. Ethylene from the very ripe banana. B. The free flow of oxygen or ethylene. C. CO2 from the very ripe banana. D. The limitation of oxygen supply. | ||
2. How can we slow down the ripening of bananas exposed to the air? | ||
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A. To rest them on the counter. B. To keep them in the basket. C. To put them on the ground. D. To hang them up from the ceiling. | ||
3. It can be concluded from the passage that _____. | ||
[ ] | ||
A the ripening banana is a self-contained system B. the rate of ripening bananas is affected by the environment C. wrapped bananas experience no chemical changes to ripen D. ripening bananas give off oxygen, CO2 and ethylene | ||
4. Why are bananas sealed in plastic in many supermarkets? | ||
[ ] | ||
A. To make them ripen more quickly. B. To make them ripen more slowly. C. To make banana flesh soften. D. To turn green bananas yellow. |
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科目: 來源:0106 月考題 題型:閱讀理解
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科目: 來源:廣東省期末題 題型:閱讀理解
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科目: 來源:0117 期末題 題型:閱讀理解
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科目: 來源:福建省模擬題 題型:閱讀理解
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科目: 來源:福建省模擬題 題型:閱讀理解
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