单项选择题
The most obvious and rapid change in the development of a language takes place in the area of______.
A．pronunciation
B．vocabulary
C．grammar
D．speech
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单项选择题
The famous spy story books about the hero James Bond(007) are written by______.
A．Agatha Christie
B．Dorothy Sayers
C．Ian Fleming
D．Conan Doyle
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单项选择题
In the idiom in good feather , we change good into high, full without changing meaning. This change of constituent is known as______.
A．addition
B．replacement
C．position-shifting
D．variation
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