The use of chemicals and fertilizers in farming is meant to increase ______.A．the quantity

A.reforming

B.relating

C.regulating

D.registering

A．was not used in the past

B．involves the use of chemicals

C．is not liked by most people

D．is no longer used by hunter

Biological treatment may use __ to treat sewage (1)living organisms (2)chemicals (3)additives

A.(1)

B.(2)

C.(3)

D.(1)(2)(3)

A．natural process

B．quality

C．the use of chemicals and fertilizers

D．quantity

A．The economy of the countries will suffer

B．Unemployment in the countries will grow

C．Some people and scientists will criticize them

D．The chemical producers will strongly protest

A．vegetables grown in natural process

B．vegetables grown with the use of chemicals and fertilizers

C．essential part of a healthy diet

D．not especially defined

A big difference between Kojo and Sorie was that ______.

A．Kojo took chemicals for some useful experiment but Sorie only wasted his in making an alcoholic drink.

B．Sorie was rich but Kojo was poor

C．Kojo had a guilty conscience but Sorie did not

D．when Kojo objected, Sorie proved that what they were doing was reasonable

ity and acidity of water in boiler by pH test paper ？ the result shows the boiler water is in acidiity . please describe what the possible cause is .

tists have sounded the sun this summer. The warning: The sun’s summer time rays are more dangerous than once thought.

A team of scientists from 80 nations recently reported to the United Nations that a layer of ozone(臭氧层) in the atmosphere which protects humans from harmful levels of ultraviolet (紫外的) radiation will be thinner over the United States this summer. The thinner layer allows more ultraviolet rays from the sun to reach earth. The extra amount of ultraviolet radiation could cause an increase in the number of cases of skin cancer.

Scientists first became concerned about the ozone layer in the mid-1980s when a hole was discovered in the layer above Antarctic during the winter. The hole was caused by chemicals used in refrigerators and air conditioners. When these chemicals are sent out into the atmosphere they produce gases that destroy the ozone.

Concern about the protective ozone layer rose more recently when data (数据) from satellites and ground stations showed that ozone levels were dropping over areas other than Antarctic. Low ozone Levels were recorded in the spring and summer over the United States and over other populated areas in the world.

Although many countries have already begun stopping the use of ozone-destroying chemicals the new findings are？ expected to advance the timetable for a total ban(禁止) of the chemicals.

1.The scientists have observed the ozone layer ________.

A.since 1980

B.since last winter

C.for more than 10 years

D.for about one year

2.The ozone layer in the atmosphere can ________.

A.do a lot of good to human beings in many ways

B.protect humans from diseases caused by bad weather

C.do a lot of harm to human beings in the summer time

D.protect humans from harmful levels of ultraviolet radiation

3.Scientists first found that there was a hole in the ozone layer ________.

A.above Arctic during the winter in the mid-1980

B.above Antarctic during the winter in the mid-1980

C.over somewhere in the north of the equator in 1980

D.over somewhere in the summer time in the mid-1980s

4.The damage to the ozone layer was caused by ________.

A.the changeable weather

B.ozone-destroying chemicals

C.chemicals from refrigerators

D.chemicals from air conditioners

5.Which of the following is NOT true？（）

A.The use of ozone-destroying chemicals have already been stopped

B.The ozone levels in the spring and summer over the USA were low

C.More and more people have begun to protect the natural surroundings

D.Many countries have already taken measures to protect ozone layer

Questions are based on the following passage．

According to a report from the Harvard School of Public Health， many everyday products， including some bug sprays and cleaning fluids， could lead to an increased risk of brain and behavioral disorders in children．The developing brain， the report says， is particularly （36） to the toxic effects of certain chemicals these products may contain， and the damage they cause can be （37） ．

The official policy， however， is still evolving．Health and environmental （38） have long urged U．S．government agencies to （39） the use of some of the 11 chemicals the report cites and called for more studies on their long-term effects．In 2001， for example， the Environmental Protection Agency（40）the type and amount of lead that could be present in paint and soil in homes and child-care （41）， after concerns were raised about lead poisoning．The agency is now （42）the toxic effects of some of the chemicals in the latest report．

But the threshold for regulation is high．Because children"s brain and behavioral disorders， like hyperactivity and lower grades， can also be linked to social and genetic factors， it"s tough to pin them on exposure to specific chemicals with solid （43）evidence， which is what the EPA requires．Even the Harvard study did not prove a direct（44）but noted strong associations between exposure and risk of behavioral issues．

Nonetheless， it"s smart to（45）caution．While it may be impossible to prevent kids from drinking tap water that may contain trace amounts of chemicals， keeping kids away from lawns recently sprayed with chemicals and freshly dry-cleaned clothes can"t hurt．

A．advocates

B．compact

C．correlation

D．exercise

E．facilities

F．interaction

G．investigating

H．overwhelmed

I．particles

J．permanent

K．restricted

L．simulating

M．statistical

N．tighten

O．vulnerable

第（36）题选

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composed of agricultural and mining wastes. About 3 percent is from industrial wastes. 250 million tons of garbage and refuse come out from homes, schools, office buildings, stores and hospitals.

This mass of metals, paper, food, plastic, rubber and glass which is all mixed together seems of no earthly use to anyone.

Or is it？ Scattered efforts across the country indicate that new technology, properly applied, might someday turn these millions of tons of refuse into an excellent source of raw materials for new uses.

Several new projects are carried out to study the possibility of treating wastes through pyrolysis (高温分解)--a system of reducing refuse to basic chemicals, liquids and gases which have commercial value. In Florida, a special tube system provides automatic transport of refuse to a central collection building.

In short, many new ideas are being tested, and many will be needed, since no one method is likely to prove suitable everywhere.

However, many difficult economic and social questions must be answered before real progress can be made. Can recovered materials compete with new materials？ What will be needed as encouragement to make resource recovery work？ Will citizens pay the costs of changing our waste system？

The article suggests that garbage and refuse from homes and public places ______.

A．make up the largest percentage of solid wastes

B．make up a small percentage of solid wastes

C．are not really considered in the solid waste problem

D．are considered of no use to the earth