Probably you have seen photos of the Grand Canyon（峡谷）, the great valley in the desert country of Arizona. But you must go there yourself to feel its true size and beauty. The Grand Canyon is one of the greatest natural wonders of the world

The Colorado River formed the Grand Canyon over millions of years. Slowly, the river cut down through hard rock. At the same time, the land was rising. Today the canyon is 1.5 kilometers and 445 kilometers long. The oldest rocks at the bottom of the canyon are more than 1 billion years old. The width varies from about 200 meters to 29 kilometers across. The rim or top of the canyon is about 2,300 meters above sea level on the South Rim, and about 3,000 meters on the other side. As a result, there are different kinds of plants and animals on opposite sides of the canyon. The South Rim is dry desert country. The North Rim has tall forests.

The canyon looks different at different times of day, and in different seasons and weather. At sunrise and sunset the red, gold, brown and orange colors of the rocks are especially clear and bright. In winter, the canyon is partly covered with snow.

The view from the South Rim of the Grand Canyon is the best. Most visitors come here and stay in campgrounds or hotels. Every point along the canyon’s edge offers a different view.

The North rim of the Canyon is quieter. It takes all day to drive there from the South Rim because there is only one bridge across the Colorado River. On the way, you go through Navado Indian lands, and a colorful pink desert called “The Painted Desert”.

1.The best way to feel the true beauty of the Grand Canyon is to________.

2. The scene of the canyon is ________.

3. If you want to visit the North Rim from the South Rim, you________.

4. If you want to have a visit to the Grand Canyon, you’d better go to _______.

Probably you have seen photos of the Grand Canyon（峡谷）, the great valley in the desert country of Arizona. But you must go there yourself to feel its true size and beauty. The Grand Canyon is one of the greatest natural wonders of the world

The Colorado River formed the Grand Canyon over millions of years. Slowly, the river cut down through hard rock. At the same time, the land was rising. Today the canyon is 1.5 kilometers and 445 kilometers long. The oldest rocks at the bottom of the canyon are more than 1 billion years old. The width varies from about 200 meters to 29 kilometers across. The rim or top of the canyon is about 2,300 meters above sea level on the South Rim, and about 3,000 meters on the other side. As a result, there are different kinds of plants and animals on opposite sides of the canyon. The South Rim is dry desert country. The North Rim has tall forests.

The canyon looks different at different times of day, and in different seasons and weather. At sunrise and sunset the red, gold, brown and orange colors of the rocks are especially clear and bright. In winter, the canyon is partly covered with snow.

The view from the South Rim of the Grand Canyon is the best. Most visitors come here and stay in campgrounds or hotels. Every point along the canyon’s edge offers a different view.

The North rim of the Canyon is quieter. It takes all day to drive there from the South Rim because there is only one bridge across the Colorado River. On the way, you go through Navado Indian lands, and a colorful pink desert called “The Painted Desert”.

The best way to feel the true beauty of the Grand Canyon is to________.

A. see its photographs                      B. listen to the report about it

C. watch its introduction on TV             D. go there yourself and visit it

The scene of the canyon is ________.

various depending on different time and places

almost the same    

various depending on different time

various depending on different places

If you want to visit the North Rim from the South Rim, you________.

A．can go there in many direction                B．won’t spend much time on the way

C．can visit The Painted Desert on the way       D．needn’t go across any bridges

If you want to have a visit to the Grand Canyon, you’d better go to _______.

A. the North Rim     B. the South Rim   C. the bottom        D. Navado Indian Lands

Probably you have seen photos of the Grand Canyon（峡谷）, the great valley in the desert country of Arizona. But you must go there yourself to feel its true size and beauty. The Grand Canyon is one of the greatest natural wonders of the world

The Colorado River formed the Grand Canyon over millions of years. Slowly, the river cut down through hard rock. At the same time, the land was rising. Today the canyon is 1.5 kilometers and 445 kilometers long. The oldest rocks at the bottom of the canyon are more than 1 billion years old. The width varies from about 200 meters to 29 kilometers across. The rim or top of the canyon is about 2,300 meters above sea level on the South Rim, and about 3,000 meters on the other side. As a result, there are different kinds of plants and animals on opposite sides of the canyon. The South Rim is dry desert country. The North Rim has tall forests.

The canyon looks different at different times of day, and in different seasons and weather. At sunrise and sunset the red, gold, brown and orange colors of the rocks are especially clear and bright. In winter, the canyon is partly covered with snow.

The view from the South Rim of the Grand Canyon is the best. Most visitors come here and stay in campgrounds or hotels. Every point along the canyon’s edge offers a different view.

The North rim of the Canyon is quieter. It takes all day to drive there from the South Rim because there is only one bridge across the Colorado River. On the way, you go through Navado Indian lands, and a colorful pink desert called “The Painted Desert”.

11. The best way to feel the true beauty of the Grand Canyon is to________.

  A. see its photographs            B. listen to the report about it

  C. watch its introduction on TV    D. go there yourself and visit it

12. According to the second paragraph, ________.

the Grand Canyon has a short history      

B. its size never changed in the history

C. the Grand Canyon was formed by the earthquake 

D. You can enjoy different scenery on different sides of the canyon

13. The scene the canyon is ________.

various depending on different time and places

the same    

various depending on different time

various depending on different places

14. If you want to visit the North Rim from the South Rim, you________.

can go there in many directions

won’t spend much time on the way

can visit The painted Desert on the way

needn’t go across any bridges

15. If you want to have a visit to the Grand Canyon, you’d better go to _______.

   A. the North Rim                  B. the South Rim

   C. the bottom                     D. Navado Indian Lands

In older people with mild cognitive(认知)impairment(损害)，having a drink now and then——up to an average of one drink of alcohol each day——may delay progression to dementia(痴呆症)，．new research suggests．

    “While many studies have assessed(评价)alcohol consumption and cognitive

function in the elderly，this is the first study to look at how alcohol consumption

affects the rate of progression of mild cognitive impairment to dementia，”study authors Dr．Solfrizzi and Dr．Panza，from the University of Bari in Italy，said in a statement.

In the study，reported in the medical journal Neurology，the researchers assessed the occurrence of mild cognitive impairment in 1,445 subjects and progression to dementia in 121 patients with mild cognitive impairment'．

  The participants were between 65 and 84 years of age at the start of study，and they were followed for 3．5 years．Alcohol use was assessed before the survey.

    Drinking was not associated with the development of mild cognitive impairment，according to the report．However，once mild impairment occurred．Subjects who had one drink per day of alcohol had an 85 percent reduced risk of dementia compared with those who didn’t drink．

    The benefit was seen with both alcohol in general and with wine in particular．

    Having more than one drink a day，however，offered no protection against dementia compared with abstaining(戒绝)，the report indicates．   

“Neurology” in Paragraph 3 is most probably a name of _____．

  A. a newspaper     B．a magazine     C．an article    D．a play

It can be inferred that______.

A. experts have studied how alcohol consumption affects mild cognitive impairment for the first time    ‘

B．the Participants didn’t have alcohol before the survey

C．drinking shouldn’t be responsible for the development of mild cognitive impairment

  D．having more than a drink a day causes more benefit 

______ was most likely to cause the people with mild cognitive impairment to

reduce risk of dementia． 

A．Soft drink    B．Beer  C．Wine D．Milk

What is the text mainly about?

  A．A drink a day may do harm to the brain·   

  B．A lot of d rink a day may slow mental decline to dementia．

  C．A lot of drink a day may do harm to the brain.

  D．A drink a day may slow mental decline to dementia.