Migratory birds fly in formation to______. What makes sustained observation of flock formations very difficult?

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问题 Migratory birds fly in formation to______.
What makes sustained observation of flock formations very difficult?

选项 A、The characteristics of echelon changes.
B、Lack in hands and equipment.
C、Too many intuitive predictions.
D、Too many factors involved in echelons.

答案B

解析

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Migratory birds fly in formation to______. What makes sustained observation of flock formations very difficult?

公共英语五级笔试

公共英语（PETS）

Thenocturnalhabitsandmournfulcriesofowlshavemadethemobjectsofsuperstitionforsomepeople.

Thusourconvictionisreinforcedthatonlysocialrevolutioncanreallysolvetheproblemsofthepeople.

WhichofthefollowingstatementsabouttheEuropeansoldiersiscorrect?Accordingtotheauthor,itishardforasocietyto

Accordingtothepassage,inbuyingasecond-handvehicleitismostimportanttoknowfair______."Anindependenttechnician"

TheAmericanFamilyIntheAmericanfamilythehusbandandwifeusuallyshareimportantdecisionmaking.Whenthechildrenareo

TheAmericanFamilyIntheAmericanfamilythehusbandandwifeusuallyshareimportantdecisionmaking.Whenthechildrenareo

SmokingSince1939,numerousstudieshavebeenconductedtodeterminewhethersmokingisahealthhazard.Thetrendoftheev

RecentstudiesbytheCouncilofEuropehaveindicatedthatThelastsentenceinthesecondparagraphimpliesthat

Hespokesoquicklythatitwasdifficulttotakedownwhathewassaying.

Theplanewasfatallycrippledwhentherearcargodoorwaspulledoffinflight.

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()是按照安全生产方针和“管生产的同时必须管安全”的原则，将各级负责人员、各职能部门及其工作人员和各岗位生产人员在安全生产方面应做的事情和应负的责任加以明确规定的一种制度。

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Accordingtothenewsitem,howfarwasthecenteroftheTuesdayearthquakefromthecapitalofHaiti?

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