题目内容
.The cell phone w_______________ only 70 grams is convenient to use..
weighing
Elderly adults who regularly drink green tea may stay more agile (敏捷的) and independent than their peers over time, according to a Japanese study that covered thousands of people.
Green tea contains antioxidant chemicals (抗氧化物) that may help stop the cell damage that can lead to disease. Researchers have been studying green tea’s effect on everything from cholesterol (胆固醇) to the risk of certain cancers, with mixed results so far.
They found those who drank the most green tea were the least likely to develop “functional disability”, or problems with daily activities or basic needs, such as dressing or bathing.
Specifically, almost 13 percent of adults who drank less than a cup of green tea per day became functionally disabled, compared with just over 7 percent of people who drank at least five cups a day.
The study did not prove that green tea alone kept people agile as they grew older. Green-tea lovers generally had healthier diets, including more fish, vegetables and fruit, as well as more education, lower smoking rates, fewer heart attacks and strokes, and greater mental sharpness. They also tended to be more socially active and have more friends and family to rely on. But even with those factors accounted for, green tea itself was tied to a lower disability risk, the researchers said.
People who drank at least five cups a day were one-third less likely to develop disabilities than those who had less than a cup per day. Those people who averaged three or four cups a day had a 25 percent lower risk.
Although it’s not clear how green tea might offer a buffer (缓冲) against disability, Tomata’s team did note that one recent study found green tea extracts (提取物) seem to increase leg muscle strength in older women.
While green tea and its extracts are considered safe in small amounts, they do contain caffeine and small amounts of vitamin K, which means it could affect drugs that prevent blood clotting (凝固).
【小题1】What can be learned from the passage?
| A．Antioxidant chemicals can lead to disease. |
| B．Those who often drank green tea can’t develop “functional disability”. |
| C．“Functional disability” is related to problems with daily activities or basic needs. |
| D．People who drank at least five cups a day are not likely to become functionally disabled. |
| A．How the study was proved. | B．Why green tea-lovers can keep agile. |
| C．What healthier diets include. | D．How to lower disability risk. |
| A．Those who drank green tea can't develop “functional disability”. |
| B．Green tea alone kept people agile as they grew older. |
| C．How green tea might offer a buffer against disability. |
| D．Green tea extracts (提取物) seem to increase leg muscle strength in older women. |
What is cloning? Are there different types of cloning?
_____71____ Actually, there are different technologies which can be used for other purpose besides producing the genetic twin of another organism. A basic understanding of the different types of cloning is key to talking an informed stance on current public policy issues and making the best possible personal decisions. The following three types of cloning technologies are usually performed; recombinant DNA technology or DNA cloning, reproductive cloning, and therapeutic cloning.
___72_____
Scientists have been cloning animals for many years. In 1952, the first animal, a tadpole, was cloned. ___73_____ Since Dolly, researchers have cloned a number of large and small animals including sheep, goats, cows, mice, pigs, cats, rabbits, and a gaur. ____74____
Hundreds of cloned animals exist today, but the number of different species is limited. ____75____ Some species may be more resistant to somatic cell nuclear transfer than others. The process of stripping the nucleus from an egg cell and replacing it with the nucleus of a donor cell is a traumatic one, and improvements in cloning technologies may be needed before many species can be cloned successfully.
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A．What animals have been cloned? |
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B．All these clones were created using nuclear transfer technology |
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C．When the media report on cloning in the news, they are usually talking about only one type called reproductive cloning. |
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D．Recently Chinese scientists have also successfully cloned mammals such as an ox. |
E. Cloning is making a genetic copy of something else.
F. Attempts at cloning certain species such as monkeys, chickens, horses, and dogs, have been unsuccessful.
G. Before the creation of Dolly, the first mammal cloned from the cell of an adult animal, clones were created from embryonic cells.