对于单个齿轮来说,节圆半径就等于分度圆半径。( )
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It is impossible to ______ the news unless you read the newspaper everyday.
A. look up in
B. keep up with
C. put up with
D. catch up
Religion has a great ______ on man’s thought.
A. influence
B. responsibility
C. role
D. action
______ the book, he found out some answers to this question.
A. When reading
B. At his reading
C. As reading
D. For reading
______ come and help us.
A. Does
B. Do
C. Did
D. Will
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