单项选择题

To secure safety, Mr. Teitelbaum does all of the following EXCEPT that ______.

A．he will climb with a partner so long as he can find one
B．he carries a cell phone
C．he does a three-point check
D．he took a $400 course for tree-climbing

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单项选择题

Which of the following statements about Mr. Teitelbaum is true

A．He founded the company New Tribe.
B．His father is ashamed of his son's hobby.
C．His company deals in tree-climbing equipment.
D．He got a certificate for tree-climbin

单项选择题

Mr. Teitelbaum's three-point check involves all of the following EXCEPT ______.

A．the ground
B．the trunk of a tree
C．the helmet
D．the branches and leaves of a tree