Plants need green leaves to make food. A plant needs sunlight and carbon dioxide （二氧化碳 ) for making food and it also needs water and salts from the soil to make food too. There are certain cells ( 细胞 ) in the leaves which change carbon dioxide and water into sugar. To do this the cells need energy, which they get from the sunlight.Green leaves make food for the whole plant. A red leaf can make food too because under the red coloring of the leaf there are food-making cells. There are no leaves which are completely yellow, for they can''t make food.The plant makes sugar for its food. In sunlight green leaves make a lot of sugar. The veins ( 叶脉 ) can''t carry all this sugar away, so the leaves change the sugar into starch ( 淀粉 ), which is kept and so stored in the leaves. At night, the starch changes back to sugar. It is then carried away from the leaves. Some of the sugar is used as food by the plant while the rest is stored as starch. In some plants, food is stored in the roots; in others it is stored in the stem and in leaves, fruits and seeds.1).Which of the following best gives the main idea of this passage? ()A、How green plants make foodB、How green plants make sugar.C、How green plants get their energy.D、How green plants change sugar into starch.2).The cells in the green leaves can get the most energy when ()A、it is daytimeB、it is nightC、it is sunnyD、it is rainy3).Food is stored in roots or stems in the form of()A、sugarB、starchC、water and saltsD、carbon dioxide4).Sugar is made for its food by ()A、sunlightB、veinsC、stemsD、green leaves5).To make food, plants need a lot EXCEPT()A、the airB、the soilC、green leavesD、it is rainy

Many animals ____ green plants for their food.

A. carry out

B. base on

C. depend on

D. look for

A. continuous

B. continual

C. continually

D. continuously

otosynthesis．

A.donate

B.check

C.withhold

D.release

y, eco-friendly rain gardens are healthy for the environment and the people living and working nearby.

A rain garden is not very different from a traditional garden. It is just a far more eco-friendly garden. Usually it is built lower than the ground. Rain gardens make smart use of rain and storm water by temporarily holding water from rain and storms and letting it soak(渗透) slowly into the ground before it runs into streams or enters the public drinking water supply.

Thus, a rain garden keeps the water，allowing it to be used as needed by plants in the rain garden, rather than flowing immediately into nearby streams and going unused. The water will soak slowly into the ground within a day or two. This creates an advantage that the rain garden does not allow mosquitoes to breed. This is a simple, attractive, and eco-friendly “green” way to treat storm water.

What’s more, planting a rain garden helps reduce pollution and improve the environment. Without using expensive machinery and chemicals, rain gardens remove harmful chemicals in the rainwater and cut down on the amount of pollution reaching streams and rivers by up to 30%.

Native plants are recommended for rain gardens because they are more used to the local climate, soil, and water conditions. They may attract local wildlife such as native birds. Water your rain garden immediately after planting and once a week, unless you have had at least an inch of rain during the week. Once native plants establish the necessary root system，they will require little care.

Often，local governments and private businesses develop large rain gardens in their yards and in public parks as a way to improve the environment and solve flooding problems. However, you don’t need to be a professionally environmental engineer to create a rain garden. As long as you’re eco­conscious homeowners，you can help the environment by building smaller rain gardens in your yards.

B-21.Which of the following is NOT true for the function of rain gardens？

A、They are good for living conditions.

B、They increase pollution.

C、They can beautify the community.

D、They improve the environment.

22阅读B-21题干中Passage Two材料，完成本题。

B-22. Which of the following is the eco-friendly function of rain gardens discussed in Paragraph 4？

A、They can help reduce the pollution problem.

B、They can keep the rain and storm water.

C、They can be healthy for the people around.

D、They can make the environment more beautiful.

A、works hard

B、has a skill in growing plants

C、is wet behind the ears

D、is very experienced

The plants need sand with a___ (deep) of at least 10 to 15 cm to grow.

A.similarly

B.generally

C.naturally

D.fortunately

fundamental level – the gene.The study of genetics has （） a new industry called biotechnology.As the name suggests, it （） biology and modem technology through such techniques as genetic engineering.Some of the new biotech companies specialize in agriculture and are working feverishly to （）seeds that give a high yield, that （） diseases, drought and frost, and that reduce the need for （） chemicals.If such goals could be achieved, it would be most （）.But some have raised concerns about genetically engineered crops.

In nature, genetic diversity is created within certain （）.A rose can be crossed with a different kind of rose, but a rose will never cross with a potato.Genetic engineering, （） usually involves taking genes from one species and inserting them into another （）to transfer a desired characteristic.This could mean, for example, selecting a gene which leads to the production of a chemical with anti-freeze （） from an artic fish, and inserting it into a potato or strawberry to make it frost-resistant（），then, biotechnology allows humans to（）the genetic walls that separate species.

Like the green revolution,（）some call the gene revolution contributes to the problem of genetic uniformity---some say even more so （） geneticists can employ techniques such as cloning and （） culture(培养), processes that produce perfectly （） copies.Concerns about the erosion of biodiversity, therefore, remain.Genetically altered plants, however, raise new（）, such as the effects that they may have on us and the environment.“We are flying blindly into a new （）of agricultural biotechnology with high hopes, few constraints, and little idea of the potential（）,” said science writer Jeremy Rifkin.

1.A.manipulationB.managementC.manufactureD.maturity

2.A.got along withB.given rise toC.come up withD.lived up to

3.A.broodsB.breedsC.blendsD.blasts

4.A.hatchB.trainC.duplicateD.patent

5.A.restrictB.resistC.reverseD.retrieve

6.A.hostileB.hydraulicC.hazardousD.harmless

7.A.beneficialB.disappointingC.surprisingD.extreme

8.A.linesB.limitsC.spaceD.ages

9.A.after allB.on the other handC.in any caD.as a rest

10.A.to the pointB.in no caseC.in an attemptD.with regard

11.A.qualityB.propertyC.priorityD.quantity

12.A.In essenceB.In partC.In advanceD.In return

13.A.brakeB.blazeC.breachD.brand

14.A.whatB.asC.whereD.so

15.A.thatB.becauseC.ifD.when

16.A.skinB.tissueC.organD.muscle

17.A.resemblingB.alikeC.similarD.identical

18.A.issuesB.heightC.difficultiesD.goals

19.A.spotB.eraC.deadlineD.scheme

20.A.navigationB.mysteryC.outcomesD.destination