单项选择题

(Historically) (there) (has been) (only) two major factions(部分) in the Republican Party -- the liberals and the conservatives.（）

A. Historically
B. there
C. has been
D. only

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(Even) a professional psychologist may have difficulty talking (calm) and logically (about) (his own) problems.（）

A. Even
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C. about
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Although we are (concerned with) the problem of energy sources, we (must not) fail (recognizing) the need (for) environmental protection.（）

A. concerned with
B. must not
C. recognizing
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