单项选择题

(It is) (extremely) important (for) an engineer (to know) to use a computer.（）

A. It is
B. extremely
C. for
D. to know

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(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
B. calm
C. about
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