单项选择题

Questions 27-30

A．Tree care.
B．Throwing a rope over the branches of a tree.
C．Getting into a harness.
D．Rescuing pets.

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单项选择题A．The Walnut Tree.B．The Europa Hotel.C．The Maltravers.D．Undecided.

单项选择题The article was written to explain ______.

Questions 27-30 您的浏览器不支持 audio 元素。