| The linear flight formations of
migratory birds are called echelons. The V and the J structures are typical and
are the most readily recognized flock echelons, but other variations also occur.
Studies of several species have shown that a true V-shaped echelon is, in fact,
less common than a J formation is. There are two well-supported and complementary explanations for why birds fly in formation. One is to conserve energy by taking advantage of the upward vortex fields created by the wings of the birds in front. The other is to facilitate orientation and communication among the birds. These explanations are not mutually exclusive, and both have been backed by a variety of studies. The relative importance of each undoubtedly shifts as various factors, such as the season of the year or the purpose of individual flights, change. A. conserve energy. B. help orientation. C. facilitate communication. D. All Above. [单项选择]The reason why birds don’t get lost on long flights
A. has been known to scientists for years B. has only recently been discovered C. is known by everyone D. will probably remain a mystery [简答题]Part 1Birds
Do you like birds
What kinds of birds are there where you live
Are there many birds around your neighborhood
In your country, do birds have special meaning
Do you think we should protect birds
[填空题]A——international flight B——flight number
C——airline operation D——alternate airfield E——landing field F——international terminal G——jet way H——air-bridge I——visitors ten*ace J——airline coach service K——loading bridge L——airport inquiries M——storage room N——boarding check O——checked luggage P——concourse Q——transfer passengers ( )国际航班 ( )航空业务 [简答题]AR%
[填空题]
A—Frequent flight passenger B—Flight number C—Boarding time D—Starting airport E—Ground service F—Delayed flight G—Ticketing service H—Ticket delivery I—Online ticket booking J—Luggage check-in K—Self check-in service L--Seat selection M—Flight punctuality N—Ticket refund O—Baggage claim P—Baggage compensation Q—First class （）行李托运 （）登机时间我来回答: 提交
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