2017公共英語考試pets2級完形填空試題精選
2017年上半年公共英語考試開始備考啦，為了提高大家學習的積極性，下面是yjbys網小編提供給大家關於公共英語考試pets2級完形填空試題精選，希望對大家的備考有所幫助。
閲讀下面短文，從短文後各題所給的A、B、C和D.四個選項中選出能填人空白處的最佳選項，並在答題卡上將該項塗黑。
In September，in Britain，you may see a lot of birds 36 on roofs and telegraph e birds are are 37 together because，very soon，they will be flying 38 to much warmer lands，where they will find 39 small flying insects on which they 40 e are no such insects 4l in Britain during the winter，as it is 42 cold for them.
The swallows settle，fly off，swoop，and 43 they do many times，for they are making short 44 flights in order to be fit for the long joumey 45 them.
46 of these migrating birds leave Britain in the fly 47 for hundreds of miles 48 they reach the warm lands of not all the birds get there，for many of them perish in the stormy weather they meet with 49 .
In the spring of the following year they 50 the long and tiring journey back to return to the identical bam or tree in the 51 district which they had left the 52 autumn.
How do these birds find their 53 there and back over such vast distances?Nobody knows exactly 54 ，but it has something to do 55 winds and air currents.
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