There Pictures from outer space now show us how much land has changed on earth. These images are taken by Landsat 7, a government satellite. The satellites have been used for 27 years. They reveal the clear-cutting of forests in the northwestern part of the United States. Pictures show the loss of rain forests in South America.
NASA’s Darrel Williams speaks about the Landsat 7 Project. He said that an eruption caused trees to bum up in a large forest. Fifteen years later, pinkish images from space show that the trees and plant life are growing again. Williams says that clear-cut areas easily show up in the pictures. He wants Americans to look at how much land is being cleared of forests in our country.
Satellites have provided other information about changes on earth. In the past ten years, more than four miles have shrunk from glaciers in Alaska. Landsat 7 received these computer images of Glacier Bay in Alaska.
Hurricanes Floyd and Irene have damag
A. a bright, white light that is reflected
B. little tiny trees that are growing
C. vegetable gardens that are planted
D. a light, pinkish view from space
| There Pictures from outer space now
show us how much land has changed on earth. These images are taken by Landsat 7,
a government satellite. The satellites have been used for 27 years. They reveal
the clear-cutting of forests in the northwestern part of the United States.
Pictures show the loss of rain forests in South America. NASA’s Darrel Williams speaks about the Landsat 7 Project. He said that an eruption caused trees to bum up in a large forest. Fifteen years later, pinkish images from space show that the trees and plant life are growing again. Williams says that clear-cut areas easily show up in the pictures. He wants Americans to look at how much land is being cleared of forests in our country. Satellites have provided other information about changes on earth. In the past ten years, more than four miles have shrunk A. sightseers have noted the changes B. computer-animated views have shown the shrinkage C. one of the glaciers was hit by a ship D. the temperatures are much colder [单项选择]Now let us look at how we read. When we read a printed text, our eyes move across a page in short, jerky movement. We recognize words usually when our eyes are still when they fixate. Each time they fixate, we see a group of words. This is known as the recognition span or the visual span. The length of time for which the eyes stop—the duration of the fixation—varies considerably from person to person. It also varies within any one person according to his purpose in reading and his familiarity with the text. Furthermore, it can he affected by such factors as lighting and tiredness.
Unfortunately, in the past, many reading improvement courses have concentrated too much on how our eyes move across the printed page. As a result of this misleading emphasis on the purely visual aspects of reading, numerous exercises have been devised to train the eyes to see more words at one fixation. For instance, in some exercises, words are flashed on to a screenfor, say, atenthor a twentieth of a s A. requires a reader to take in more words at each fixation B. requires a reader to see words more quickly C. demands an deeply-participating mind D. demands more mind than eyes 我来回答: 提交
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