单项选择题

According to this passage, research in this area is characterized as ______.

A．empirically observable
B．often impossible to observe directly
C．poorly defined in the research literature to date
D．easier to theorize about than to carry out directly
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单项选择题
The reference to Naiman and his colleagues (1978) in paragraph 4 is made ______.
A．to point out the advantages of an analytical approach
B．to point out that language learning strategies can be identified
C．to point out that different learners learn differently
D．to point out the uniqueness of language learning situations
单项选择题
In paragraph 2 leaner variables and strategies are defined by reference to other writers ______.
A．because these writers are authorities in the field and these are recognized as important concepts
B．because these writers are authorities in the field and these are recognized as important definitions
C．because the present author is not sure what these terms mean
D．because the present author wishes to redefine the scope of research in this area
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