Global warming is changing the migration patterns of many birds, altering flight paths that have remained unchanged for generations and that were firmly anchored in their genes, scientists 1 .
    “Warming in Europe has 2 changed the migration direction of the warbler,”said behavior 3 Eberhard Curio 4 Bochum University in western Germany’s Ruhr region.
    The small birds native 5 central and eastern Europe 6 to migrate southwest to spend winter in southern France, Spain 7 northern Africa. But now Curio says many of them fly westward to spend the 8 months in southern England.
    “ 9 changes in migration patterns are the result of 10 selection. The birds that fly in a 11 direction will die.”the biologist said, 12 the birds that fly to more favorable destinations pass on this behavior pattern to their 13 .
    Researchers 14 believe that birds use a kind of second sense to orient their migration patterns, either a 15 orientation based on the position of the sun, or with the 16 of a sort of inner compass.
    17 animals possess a precise inner clock, they can determine their position by the sun and the stars, said Curio. Navigation by inner compass 18 the Earth’s magnetic field.
    19 , the routes taken by different 20 of birds are very much influenced by their flight capabilities.

1.
A. say
B. interpret
C. recall
D. resolve
2.
A. verbally
B. likely
C. similarly
D. probably
3.
A. learner
B. researcher
C. doctor
D. fellowship
4.
A. to
B. of
C. for
D. on
5.
A. to
B. with
C. onto
D. in
6.
A. tried
B. forgot
C. remembered
D. used
7.
A. or
B. such as
C. and
D. to
8.
A. hotter
B. cooler
C. colder
D. warmer
9.
A. Such
B. So
C. Such many
D. So many
10.
A. artificial
B. natural
C. intentional
D. perpetual
11.
A. disadvantageous
B. advantageous
C. favorite
D. bad
12.
A. but
B. therefore
C. while
D. thus
13.
A. forefathers
B. sons
C. counterparts
D. offspring
14.
A. deliberately
B. consequently
C. rightly
D. currently
15.
A. visual
B. oral
C. conscious
D. hearing
16.
A. combination
B. complaint
C. aid
D. storage
17.
A. But
B. Since
C. Then
D. Thus
18.
A. relies on
B. leads to
C. determined to
D. decides to
19.
A. Therefore
B. In addition
C. However
D. And
20.
A. kinds
B. types
C. species
D. sorts

答案：

A D B B A  

 D C C A B   

 A C D D A   

C B A B C