首页
登录
职称英语
Scientists claim that air pollution causes a decline in the world’ s average
Scientists claim that air pollution causes a decline in the world’ s average
游客
2025-05-09
16
管理
问题
Scientists claim that air pollution causes a decline in the world’ s average air temperature. In order to prove that theory, ecologists have turned to historical data in relation to especially huge volcanic eruptions. They suspect that volcanoes effect weather changes that are similar to air pollution.
One source of information is the effect of the eruption of Tambora, a volcano in Sumbawa, the Dutch East Indies ( the former name of the Republic of Indonesia) ,in April 1815. The largest recorded volcanic eruption, Tambora threw 150 million ton of fine ash into the stratosphere. The ash from a volcano spreads worldwide in a few days and remains in the air for years. Its effect is to turn in coming solar radiation into space and thus cool the earth. For example, records of weather in Eng land show that between April and November 1815, the average temperature had fallen 4.5°F during the next twenty-four months, England suffered one of the coldest periods of its history. Farmers’ re cords from April 1815 to December 1818 indicate frost throughout the spring and summer and sharp decreases in crop and livestock markets. Since there was a time lag of several years between cause and effect, by the time the world agricultural commodity community had deteriorated, no one realized the cause.
Ecologists today warn that we face a twofold menace. The ever-present possibility of volcanic eruptions, such as that of Mt. St. Helens in Washington, added to man’ s pollution of the atmosphere with oil, gas, coal, and other polluting substances, may bring us increasingly colder weather. [br] No one realized the cause of the deterioration of the world agricultural commodity market because ______.
选项
A、there was a long interval between cause and effect
B、the weather was difficult for us to forecast
C、weather forecasts were inaccurate
D、ecologists didn’t exist until modem times
答案
A
解析
根据第二段最后一句话,由于结果较原因有一段时间的间隔,所以直到农产品市场受到严重影响,人们才知道其起因。
转载请注明原文地址:https://tihaiku.com/zcyy/4068426.html
相关试题推荐
Themicroscopeenablesscientiststodistinguishanincrediblenumberandvariet
When(imaginable)scientists(first)suggestedthepossibilitythatoneperson(
Scientistsclaimthatairpollutioncausesadeclineintheworld’saverage
Scientistsclaimthatairpollutioncausesadeclineintheworld’saverage
Scientistsclaimthatairpollutioncausesadeclineintheworld’saverage
Scientistsareoftenfascinatedbyphenomenathatmanyordinarypeopleignore.A、
Japanesescientistsareatlastactivelyenteringthedebateoverthegovern
Theproblemofpollutionaswellasseveralotherissuesisgoingtobediscusse
Scientists,likeotherpeople,arealwayspleasedtohavetheirownideas______
Inasense,scientistsandengineersinthepasthavebeenfortunate,forwebec
随机试题
ThebeginningsoftheCoca-Colawerehumble.In1886,anAtlantapharmacist,
Imagineaworldinwhichtherewassuddenlynoemotion--aworldinwhichhu
"Hightech"and"stateoftheart"aretwoexpressionsthatdescribethemod
Ifyouseeafishtailsplashinashallowstream,you’llknowthatatrout
A.宫颈糜烂轻度 B.单纯型宫颈糜烂 C.宫颈糜烂重度 D.宫颈糜烂中度
治疗甲状腺功能亢进症心肝阴虚证,且对抗甲状腺药物过敏者,应首选A.甲巯咪唑加天王
SDS-Hb测定法血红蛋白最大的优点是A:呈色稳定B:操作简便C:准确性高
人在每一瞬间,将心理活动选择了某些对象而忽略了另一些对象。这一特点指的是注意的(
静脉注射吸毒是艾滋病病毒感染的A.直接病因 B.必要病因 C.促成病因 D
血管紧张素转化酶抑制剂治疗心衰和抗高血压的作用机制不包括A.抑制血管和心肌的构型
最新回复
(
0
)