Mulch is a protective cover of material that is spread on top of soil.It is usually made out of organic material, like crop waste.Farmers may keep the remains of maize or other crops on top of the soil.This creates mulch on the soil surface.The plant remains help protect the soil against wind and water damage.Mulching is one of the best things people can do for their plants.It also helps keep the soil from getting dry, and reduces the need for watering plants.It also limits temperature changes in the soil.And it stops unwanted plants, or weeds,from growing.
Organic mulch improves the condition of soil.As the mulch breaks down, it provides material which keeps the soil from getting hard.This improves the growth of roots and increases the movement of water through the soil.It also improves the ability of the soil to hold water. Organic mulch contains nutrients for plants.It also provides a good environment for earthworms and other helpful organisms in the soil.
It is easy to find organic mulch materials.Cutup leaves and small pieces of tree bark can be used.Grass cuttings are also a good mulch for plants. Mulch from newspapers works well in controlling weeds.
The best time to add mulch depends on your goal.Mulch provides a thick barrier between the soil and the air.This helps to reduce temperature changes in the soil. As a result,mulched soil will be cooler than other soil in the summer.In winter, the mulched soil may not freeze as deeply as other soil.The best time is after the ground has frozen, but before the coldest weather arrives.Spreading mulch before the ground has frozen may attract small animals searching for a warm place to spend the winter.Delaying the spreading should prevent this problem.The animals will probably find another place to live.
1.The author tells us the following EXCEPT________.
A.what mulch is and its benefits
B.the best time to add mulch
C.what can be mulched on the soil surface
D.the bad effects of mulch
2.The following can be used as organic materials to make mulch EXCEPT________.
A.tree barks B.cutup leaves
C.grass cuttings D.plastic
3.Which of the following is the benefit of mulch?
A.Protecting the soil against wind and water damage.
B.Keeping the soil wet and reducing the need for watering plants.
C.Reducing temperature changes in the soil and stopping unwanted weeds
growing.
D.All of the above.
4.The main idea of Paragraph 2 is that organic mulch can________.
A.improve the condition of soil
B.improve the ability of the soil to hold water
C.provide a good environment for earthworms
D.improve the growth of roots and increase the movement of water through the
soil
5.From the last paragraph, we know ________.
A.the best time to add mulch is in spring and summer
B. the best time to add mulch is after the coldest weather arrives
C.the best time to add mulch depends on weather
D.choosing the best time to add mulch can avoid attracting small animals
Steven Jobs was born on February 24,1955,in San Francisco,California,and was adopted by Paul and Clara Jobs.In 1961 the family moved to Mountain View, California.At that time people started to refer to the area as “Silicon Valley”.
As a child, Jobs preferred doing things by himself, not interested in team sports or other group activities.He enrolled in the HewlettPackard Explorer Club. There he saw his first computer at the age of twelve. He was very impressed, and knew right away that he wanted to work with computers.
At that time almost all computers were so large that one could fill a room, and so costly that individuals could not afford to buy them.Advances in electronics, however, meant that the parts of a computer were getting smaller and the power of the computer was increasing.
By 1980 the personal computer era was well underway.Apple was continually forced to improve its products to remain ahead, as more competitors entered the marketplace. Apple introduced the Apple Ⅲ, but the new model suffered technical and marketing problems.It was removed from the market.
Early in 1983 Jobs unveiled the Lisa.It did not sell well,however, because it was more expensive than personal computers sold by competitors.Apple's biggest competitor was International Business Machines (IBM). By 1983 it was estimated that Apple had lost half of its market share ( part of an industry's sales that a specific company has) to IBM.
In 1984 Apple introduced a revolutionary new model, the Macintosh.The Macintosh did not sell well to businesses,however.It lacked features other personal computers had, such as a corresponding high quality printer. The failure of the Macintosh signaled the beginning of Jobs's downfall at Apple.
Late in 1988 the NeXT computer was introduced, aimed at the educational market.The product was very userfriendly,and had a fast processing speed, excellent graphics displays,and an outstanding sound system.Despite the warm reception,however, the NeXT machine never caught on. It was too costly, had a blackandwhite screen, and could not be linked to other computers or run common software.
1.When did Steven Jobs first get the chance to catch sight of a computer?
A.In 1955. B.In 1961.
C.In 1967. D.In 1980.
2.Which of the following statements is RIGHT?
A.All the computes used to be large enough to fill a room.
B.Before 1980, Apple was not successful in the field of personal computers.
C.Steven Jobs was born in Silicon Valley.
D.Apple and IBM competed for sales of personal computers.
3.According to the passage, the Apple Ⅲ________.
A.was popular among the young people
B.turned out to be a failure
C.caused more competitors to come into the market
D.could be linked to a printer
4.Which of the following leads to Jobs's downfall at Apple?
A.The Apple Ⅲ. B.The Macintosh
C.The NeXT. D.The Lisa.
5.One of the reasons why the NeXT computer didn't become popular is that ________.
A.few people could afford it
B.it was not fast enough
C.it was not easy to use
D.it lacked super sound system
One cold afternoon a postman was slowly pushing his mail cart (邮车)____the hill that led out of the small town of lane.He was walking very____because there was a lot of ice on the____.He had only one more letter to deliver(传递), and this was for an old lady who lived at the____.Everybody____her “grandma”.
She had lived alone____her daughter had____to Hawaii many years before.She used to invite the postman____for coffee whenever he____her letter, and she would tell him about her two grandchildren in Hawaii,whom she had____seen.However, she had lots of____of them, which she used to____him.
Just as the____came near her gate,a small boy came____down the hill.Suddenly the boy slipped on the ice and fell.The postman stopped his mail cart and hurried____the street to help the boy.After a quick____,he saw that he had hurt his leg very badly.In fact, he was____that the boy's leg had been broken. He knew that “grandma” did not have a____,so he stopped a____driver and asked him to____the boy to Lance Hospital.
1.A.down B.up
C.along D.around
2.A.bravely B.carefully
C.fast D.slowly
3.A.cart B.ground
C.field D.road
4.A.gate B.bottom
C.end D.top
5.A.named B.shouted
C.called D.talked
6.A.ever since B.just as
C.ever after D.until
7.A.left B.came
C.moved D.been
8.A.in B.there
C.up D.to
9.A.carried B.sent
C.wrote D.brought
10.A.already B.often
C.never D.hardly
11.A.pictures B.letters
C.news D.things
12.A.tell B.show
C.give D.send
13.A.postman B.lady
C.children D.boy
14.A.and ran B.to run
C.ran D.running
15.A.in B.on
C.across D.into
16.A.search B.look
C.hurry D.test
17.A.sad B.angry
C.afraid D.disappointed
18.A.driver B.TV set
C.telephone D.radio
19.A.passing B.careful
C.good D.walking
20.A.send B.bring
C.get D.take
Since then the population of London________by almost 50,000 a year—an increase largely fuelled by immigration.
A.has risen B.have risen
C.rises D.rise
—Don't always turn to particular patterns time after time in our life.
—I agree. We would otherwise________our thinking by rules or common attitude.
A.inspect B.limit
C.judge D.recover
Everyone knows how________feels to get so angry that you want to throw things or even hurt others.
A.that B.it
C.he D.you