首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
考研
Imagine fishermen walking down to the seashore, ready to carry out their early morning routine of preparing their boats and net.
Imagine fishermen walking down to the seashore, ready to carry out their early morning routine of preparing their boats and net.
admin
2012-05-19
57
问题
Imagine fishermen walking down to the seashore, ready to carry out their early morning routine of preparing their boats and net.【C1】______they hope for a good catch of fish. But to their 【C2】______, a horrible sight meets their still sleepy eyes. Thousands of fish have been washed【C3】______dead. The cause of this mass destruction? A red tide!
Red tides are a global【C4】______. They have been observed on both the Atlantic and the Pacific coasts of the United States and Canada. They have also【C5】______in many other places. Though relatively few people are【C6】______them, red tides are not new.
In the Philippines, a red tide was first seen in the province of Bataan in 1908. Since then, red tides have been seen in many other【C7】______. A Philippines red tide expert told us that "【C8】______the fish kills, the Philippines has documented 1, 926 cases of dead shellfish poisoning caused by red tides. "
The term "red tide"【C9】______the discoloration of water that sometimes occurs in certain areas of the ocean or sea. Although the color is often red, it may also be【C10】______of brown or yellow. The World Book Encyclopedia reports that "the discolored areas may range from【C11】______a few square yards to more than 2,600 square kilometers. "
What causes such discoloration? Red tides are generally caused by several【C12】______of single-celled organisms. These tiny organisms have hair-like projections which they use to【C13】______themselves in water. There are about 2,000 varieties of these organisms, 30 of which carry poisonous【C14】______. These minute organisms usually stay in warm waters with high content of salt.
A red tide occurs when there is a sudden and rapid【C15】______of these organisms. The concentration of these organisms may【C16】______to 50,000,000 per quart of water! Although scientists do not fully understand why this happens, it is known that these organisms【C17】______when certain conditions simultaneously affect the water. These include abnormal weather, 【C18】______temperatures, an oversupply of nutrients in the water, a generous【C19】______sunlight, and favorable water currents. When a heavy rainfall occurs, minerals and other nutrients are sometimes washed【C20】______the land into coastal water. These nutrients can contribute to the breeding of the organisms. The result? Red tides!
【C7】
选项
A、sandy beaches
B、river mouths
C、coastal areas
D、reef areas
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/w8p4777K
0
考研英语一
相关试题推荐
Highoilpriceshavenotyetproducedaneconomicshockamongconsumingcountries,butfurtherrises,especiallysharp(1)_____,
TheStudents’UnionofyourdepartmentisplanninganEnglishSpeechContest.Writeanannouncementwhichcoversthefollowing
Whatwouldpeopleusuallydowiththeirgrocerylistaftershopping?BillKeaggycollectsgrocerylistsbecause
Fromthepassageweknowthattheauthorisveryconcernedwiththerolethat______.Whowillbenefitmostfromafamilypatte
Youaregoingtoreadatextaboute-mail,followedbyalistofdetailexplanationsorcitedstatements.Choosethebestrelate
Accordingtothepassage,CDCisanorganizationthatWeknowfromtheauthor’ssuggestionsthat
Youaregoingtoreadatextaboutthetipsonpreparinganewgarden,followedbyalistofexamples.Choosethebestexamplef
Breakfastisindispensable.Notonlydoesitprovideessentialearly-morningnourishmenttopeopleofallagesthroughoutthewe
Imaginebeingaskedtospendtwelveorsoyearsofyourlifeinasocietywhichconsistedonlyofmembersofyourownsex.Howw
随机试题
A.阴阳相互交感B.阴阳对立制约C.阴阳互根互用D.阴阳相互转化“寒极生热,热极生寒”的机理是
关于儿茶酚胺与β受体结合后产生的效应,下列哪项叙述是错误的
此时首先应考虑的检查为为支持诊断而应选择的检查方法为
男性,62岁。头晕、乏力半年,近1个月症状加重,间有低热,四肢酸痛来诊。体检:体温38℃,重度贫血貌,下肢皮肤散在出血点;颈部可扪及花生仁大小淋巴结2枚,脾肋下2cm。化验:Hb50g/L,WBC2.3×109/L,PLT45×109/L,血片中
革兰氏阴性菌的黏附因子是()。
下面关于渗井的描述错误的是()。
某企业2018年年初拥有房产3栋,分别为:厂房1栋,原值500万元,已经使用5年,预计还可以使用20年;办公楼l栋(10层),原值1000万元,已经使用1年,预计还可以使用19年;仓库1栋,原值150万元,已经使用10年,预计还可以使用15年。2018年6
下列代理行为中,属于滥用代理权的有()。
某公司在2000年1月1日平价发行新债券,每张面值1000元,票面利率10%,5年到期,每年12月31日付息(计算过程中至少保留小数点后4位,计算结果取整)。要求:(1)2000年1月1日到期收益率是多少?(2)假定2001年1月1日的市场利率下降到
所谓信息系统集成是指()。
最新回复
(
0
)