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In the month of September, in Britain, you may see large numbers of birds (1) on roofs and telegraph wires. These birds are swallows. They are (2) together because, very soon, they will be flying (3) to much warmer lands, where they will find (4) the small flying insects on which they (5). There are no such insects (6) in Britain during the winter; it is (7) cold for them.
The swallows settle, fly off, swoop, and (8) again. This they do many times, for they are making short (9) flights in order to be fit for the long journey (10) them.
(11) of these migrating birds leave Britain in the autumn. They fly (12) for hundreds of miles (13) they reach the warm lands of Africa. But not all the birds get there, for many of them perish in the stormy weather they meet with (14).
In the spring of the following year they (15) the long and tiring journey back to Britain. They return to the identical barn or tree in the (16) district which they had left the (17) autumn. How do these birds find their (18) there and back over such vast distances? Nobody knows exactly (19), but it has something to do (20) winds and air currents.

问题1选项
A.being perched
B.perched
C.being perching
D.be perched
问题2选项
A.gathering
B.assembling
C.waiting
D.forming
问题3选项
A.to south
B.the south
C.to southwards
D.south
问题4选项
A.great number of
B.a great deal of
C.plenty of
D.numerous
问题5选项
A.feed
B.are fed
C.eat
D.rely
问题6选项
A.near
B.about
C.nearby
D.over
问题7选项
A.too
B.a bit
C.very
D.much
问题8选项
A.fly off
B.swoop
C.settle
D.turn back
问题9选项
A.practical
B.practicing
C.practice
D.practiced
问题10选项
A.in advance
B.ahead of
C.in front of
D.in front
问题11选项
A.Swarms
B.Herds
C.Flocks
D.Schools
问题12选项
A.firmly
B.stoutly
C.harshly
D.steadily
问题13选项
A.until
B.before
C.when
D.as
问题14选项
A.in the way
B.on the way
C.half the way
D.all the way
问题15选项
A.have
B.fly
C.find
D.make
问题16选项
A.old
B.original
C.familiar
D.identical
问题17选项
A.before
B.previous
C.above going
D.former
问题18选项
A.way
B.path
C.course
D.route
问题19选项
A.why
B.when
C.how
D.what
问题20选项
A.against
B.away
C.for
D.with
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